Malachi 4:5  KJV  "Behold, I will send you Elijah the prophet before the second coming of the great and dreadful day of the Lord:"

Interpretation based on the following study:  Lo!  (expression of expectation and certainty, calling attention to something about to happen, to announce with vividness and emotional involvement)  I release from near with me, the Most High God Yehowah, One who speaks and communicates My Word, to tell and show forth My will and thoughts, My companion, to teach, instruct and give spiritual discernment, from My presence, to go and bring, carry from one place to another, present daily, continually always, perpetually, Yehowah Supreme God, Greatest, Mighty, Eldest, of importance, dignity and majesty, powerful and central, honored and highly valued, exalted in recognized power and position of reverence.  (sit and let this sink in, focusing on the meaning, it is always about Yeshua, Jesus our Savior)

Hebrew:  hinneh anokiy shalak eth eliyah nabiy paniy bo yowm yehowah gadol yare

Definitions/Hebrew Strong's numbers:

2009-hinneh:  Lo!  expressing strong feelings, surprise, hope, expectation, certainty, thus giving vividness depending on its surrounding context, indicates a call to realize something God or others have done, calling attention to something about to happen, to announce, adds vividness and emotional involvement

595-anokiy:  I, me, which

7971-shalak:  to send away, for or out, go, put forth, lay, send out, put away, cast out, stretch out, set, depart, sow, loose, appoint, bring on the way, conduct, forsake, give up, grow long, leave, let depart, push away, reach forth, spread, get rid of, to initiate, to see to it that it occurs, to successfully conclude an action, initiation of the action, sending someone or something as a messenger to a particular place, send word by messenger, send a message, send a letter, send instructions, letting something go freely or without control, send away, send someone on their way, divorcing, separation, setting free, release someone held by force, let go, hand someone over, gave them up unto their own hearts' lust, set something afire, to be left to oneself, getting his own way to bring shame, branch, shoot, fountain, channel, dismissal, to be safe, make complete, recompense, reward, restore, restitution, finish, amend, full, make perfect, action is completed, complete negotiation, make peace, compensation, whole, made ready

853-eth:  sense of entity, self, used to point out more definitively the object of a verb or preposition, even, namely, nearness, near, with, by, at, among, before, approach, meet, deliver, seek, long for, beseech, pray, appearing, signal, beacon, sign, evidence, mark, banner, reminder, attestation of validity conforming to revelation, warning, indicators, assent, consent, to come, happen, travail

452-eliyah:  Most High God Yehowah, Almighty Majesty, Most Powerful And Vehement, Self-Existent Eternal God Who Saves And Redeems

5030-nabiy:  the one who speaks for another, communicating the word of God, mouth, telling and showing forth the will and thoughts of God, companion, follower, speak by inspiration, speak God's message under the influence of the Holy Spirit, to speak God's Word to the people, calling them to covenant faithfulness and relationship, to pierce, to teach, point out, shew forth, instruct, utterance, wighty message, oracle, by burden we are to understand the message laid on the mind and heart, burden of message, spiritual discernment

6440-paneh:  the face, before, presence, in the sight of, countenance, upon, from, toward, open, beseech, favor, look, personally, visible, front, visage, in person, pleased with, accepted, approved, consent, reconcile, delighted with, pleased to make friends with, graciously received, in a spirit cognate to His own, great pleasure and joy, satisfaction, enjoy, affection, goodwill, to lift, bear and carry, forgive, undertaking of responsibility for sins of others by substitution or representation, bear and endure with, make and have room for, receive gladly to accommodate without reservation, close association, commune with, nearness, vitally connected, granting a request, assent, take delight in, to incline to, desire, to bend toward, to take care of, favorable disposition, willing, standing in close relationship with, to choose and prefer, choice, require, need, select, obtain, possess, occupy

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

3117-yowm:  to be hot, day, warm hours, daily, ever, continually, always, full, whole, perpetually, remain, time, moment, period

3068-Yehowah:  Supreme God, Self-Existent and Eternal Almighty Most High Highest God, God Who Effects His Will, the One True God

1419-gadol:  great, high, greatest, mighty, eldest, of extended dimension of number, power or value and importance, magnified beyond the borders, divine, freshness, anew, majesty, great dignity, strong, wealthy, magnificent, powerful, significant, important and central, principal, chief, honored, very highly valued, well known and acquainted with, stout

3372-yare:  to fear and revere, terrible, reverence, stand in awe, exalted, recognized power and position of individual revered rendering Him proper respect, submission to proper ethical relationship to God, used absolutely to refer to the heavenly and holy attributes of something or someone, showing proper honor, exceedingly revered 

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.