engage, (inter-)meddle (with), mingle (self), mortgage, occupy, give pledges, be(-come, put in) surety, undertake

Boyd’s Bible Dictionary:

(holding before). [EARNEST.] [LOAN.]

“Mortgage, To” From Concise Bible Dictionary:

On the return of the Jews from exile, there were many poor, and in order to get food they borrowed money on their land, which gave the lender a claim on the property, even as mortgages are now negotiated. The money was lent by rich Jews, and Nehemiah was very angry at their exacting usury and strongly condemned them. They ought to have given sustenance to their poorer brethren (Neh. 5:33Some also there were that said, We have mortgaged our lands, vineyards, and houses, that we might buy corn, because of the dearth. (Nehemiah 5:3)).

“Pledge” From Concise Bible Dictionary:

The taking of articles as security for loans, etc. was very early practiced, and restrictions were given in the law that no unfair advantage should be taken thereby (Ex. 22:2626If thou at all take thy neighbor's raiment to pledge, thou shalt deliver it unto him by that the sun goeth down: (Exodus 22:26); Deut. 24:10-1710When thou dost lend thy brother any thing, thou shalt not go into his house to fetch his pledge. 11Thou shalt stand abroad, and the man to whom thou dost lend shall bring out the pledge abroad unto thee. 12And if the man be poor, thou shalt not sleep with his pledge: 13In any case thou shalt deliver him the pledge again when the sun goeth down, that he may sleep in his own raiment, and bless thee: and it shall be righteousness unto thee before the Lord thy God. 14Thou shalt not oppress an hired servant that is poor and needy, whether he be of thy brethren, or of thy strangers that are in thy land within thy gates: 15At his day thou shalt give him his hire, neither shall the sun go down upon it; for he is poor, and setteth his heart upon it: lest he cry against thee unto the Lord, and it be sin unto thee. 16The fathers shall not be put to death for the children, neither shall the children be put to death for the fathers: every man shall be put to death for his own sin. 17Thou shalt not pervert the judgment of the stranger, nor of the fatherless; nor take a widow's raiment to pledge: (Deuteronomy 24:10‑17); Job 22:66For thou hast taken a pledge from thy brother for nought, and stripped the naked of their clothing. (Job 22:6); Job 24:3,93They drive away the ass of the fatherless, they take the widow's ox for a pledge. (Job 24:3)
9They pluck the fatherless from the breast, and take a pledge of the poor. (Job 24:9); Amos 2:88And they lay themselves down upon clothes laid to pledge by every altar, and they drink the wine of the condemned in the house of their god. (Amos 2:8)). In 2 Kings 18:2323Now therefore, I pray thee, give pledges to my lord the king of Assyria, and I will deliver thee two thousand horses, if thou be able on thy part to set riders upon them. (2 Kings 18:23) and Isaiah 36:88Now therefore give pledges, I pray thee, to my master the king of Assyria, and I will give thee two thousand horses, if thou be able on thy part to set riders upon them. (Isaiah 36:8) the sense is “to make an engagement or treaty.”

Strong’s Dictionary of Hebrew Words:

Number:
6148 (find all occurrences in KJV Bible)
Transliteration:
`arab
Phonic:
aw-rab’
Meaning:
a primitive root; to braid, i.e. intermix; technically, to traffic (as if by barter); also or give to be security (as a kind of exchange)
KJV Usage:
engage, (inter-)meddle (with), mingle (self), mortgage, occupy, give pledges, be(-come, put in) surety, undertake