Malachi 4:6  KJV  "And he shall turn the heart of the fathers to the children, and the heart of the children to their fathers, lest I come and smite the earth with a curse."

Interpretation based on the following study:  Return to the starting point, movement back to the point of departure, restore, bring back, reverse, rescue, deliver, recover, retrieve, refresh, convert the heart, the inner seat of desire, motive and inclination, understanding and wisdom, affection and aims, principles and influences, conscience and moral character, center and source of all action and deeds, intellect, emotions and thoughts, the inner being.  Our Father, Lord and Ruler of all, One who begot and protects, Highest Most High Yehowah, repairs and rebuilds His family that was destroyed, to connect again His children to His heart.  He sets up to found and establish, joining us in affinity to bind us in His love, to attach us in delight to Himself, our powerful and strong Parent, away from being broken and afflicted, to bring and return us to be near and close to Him.  He removes us from the sorrow and determined destruction of the nations.

Hebrew:  shuwb leb ab al ben leb ben al ab pen bo nakah eth erets 

Definitions/Hebrew Strong's numbers:

7725-shuwb:  to turn back, to retreat, return to the starting point, again, return again, restore, bring back, answer, recompense, recover, deliver, withdraw, requite, reply, convert, recall, refresh, relieve, rescue, retrieve, reverse, reward, pay, to go back, movement back to the point of departure, returning along a path already traversed, turn away from, reverse a direction, opposite of going out, recede, to follow after, cessation of something, go away, disappear, destroying, repetition, conversion and turning to God, turning back again to Him from whom we were separated by His redemption and preservation, expire, beginning, salvation, deliverance, safety, victory, saved in the Lord with an everlasting salvation, to be sorry, to pity, console, comfort, repent, ease, to make a strong turning to a new course of action, turning to a positive course with strength, exerts strength to change, re-grasp the situation, exert effort for the situation to take a different course of purpose and action, restoration, consolation, ruefulness, desistance

3820-leb:  heart, most interior, mind, understanding, midst, inner person, soul, seat of desire, inclination, or will, seat of knowledge and wisdom, center of anything, motives, feelings, affections, aims, principles, thoughts, intellect, source of all action, center of all thoughts and feelings, receptive to the influences both from outer world and from God Himself, seat of emotions, seat of conscience and moral character, fountain of person's deeds, inner being, within

1-ab:  father, chief, principal, parent, progenitor, first, founder, title of respect, teacher, husband, advisor, Lord of All, ruler, occupied position or status and received the honor due, the One Who begot and protects, the One deserving reverence and obedience, judge, central

5921-al:  Highest, Most High, aloft, Yehowah, above, on high, over, upon, in throughout, beside, exalted, powerful and strong

1121-ben:  to build, build up, builder, made, built again, repair, set up, have children, obtain children, fortify, rebuild, construct, found, establish, manufacture, to fashion and make, rebuilding something that is destroyed, building one's house, conceive a child, found a dynasty, have offspring and descendants, expressing a unique and unbreakable relationship, family, children of the Most High, something belonging to, captive, heir, beloved, choice, to choose and prefer, favor, desire, long for, to relate and associate closely, espoused, wedding, relate by marriage, union, joined, coupled, twinned, close, marked, owned, possessed, occupied, taken, contract affinity, join in affinity, sealed and joined, combined, conjoined, bind together, hold, gathered, to love and delight in, attached, connected, constrained in love

3820-leb:  heart, most interior, mind, understanding, midst, inner person, soul, seat of desire, inclination, or will, seat of knowledge and wisdom, center of anything, motives, feelings, affections, aims, principles, thoughts, intellect, source of all action, center of all thoughts and feelings, receptive to the influences both from outer world and from God Himself, seat of emotions, seat of conscience and moral character, fountain of person's deeds, inner being, within

1121-ben:  to build, build up, builder, made, built again, repair, set up, have children, obtain children, fortify, rebuild, construct, found, establish, manufacture, to fashion and make, rebuilding something that is destroyed, building one's house, conceive a child, found a dynasty, have offspring and descendants, expressing a unique and unbreakable relationship, family, children of the Most High, something belonging to, captive, heir, beloved, choice, to choose and prefer, favor, desire, long for, to relate and associate closely, espoused, wedding, relate by marriage, union, joined, coupled, twinned, close, marked, owned, possessed, occupied, taken, contract affinity, join in affinity, sealed and joined, combined, conjoined, bind together, hold, gathered, to love and delight in, attached, connected, constrained in love

5921-al:  Highest, Most High, aloft, Yehowah, above, on high, over, upon, in throughout, beside, exalted, powerful and strong

1-ab:  father, chief, principal, parent, progenitor, first, founder, title of respect, teacher, husband, advisor, Lord of All, ruler, occupied position or status and received the honor due, the One Who begot and protects, the One deserving reverence and obedience, judge, central

6435-pen:  removal, peradventure that, lest, that not, to turn to face, appear, look prepare, regard, respect, look back, turn back, behold, come, dawning, to turn toward, turn around, to attach to, make clear, to turn as to face and look at something or someone, seeing, recognition, acknowledge, attend, pay attention to someone, giving up fighting and fleeing, to clear and set in order, prepared for to come in and commune

935-bo:  to go or come, bring, enter, carry, movement in space from one place to another, cause to enter, bring into, to return, go forth, cohabitation, coming, appear, present

5221-nakah:  to strike, smite, slay, kill, beat, slaughter, stricken, given, wounded, stripes, cast forth, dejected, contrite, maimed, lame, smitten, afflicted, broken, drive away, smiting into powder

853-eth:  sense of entity, self, pointing out definitively the object, even, namely, nearness, near with, by, among, idea of contraction in anguish longing for, to approach, to meet, deliver, seek, groan, lament, mourn, cry after, beseech, where? pray, ask after, call for, require, need, wail, crying out for, sorrow, distressed, troubled, woeful, sign, portent, appearing, mark

776-erets:  to be firm, the earth, ground, world, nations, land, temporal scene of human activity, experience and history, material world, terrestrial planet, soil, property or possession, territory, estate, earthly, massing, foreign nations, people, unit, body

2764-kerem:  shutting in, a net, usually a doomed object, extermination, accursed thing, devoted for destruction, to seclude, utterly to make away with

Definitions derived from:  The New Strong's Expanded Exhaustive Concordance of the Bible, red letter edition, Hebrew & Greek Dictionary, 2010 edition.  CWP Teacher edition Interlinear Bible.  The Complete Word Study Dictionary Old Testament.