What does Proverbs 6:3 mean?
Solomon is explaining the dangers of "[putting] up security" for someone else's borrowing. This is equivalent to the modern idea of cosigning: agreeing to pay on behalf of the other person if they fail to make good on the debt. Agreeing to that obligation when the borrower is a stranger, unreliable, or the loan has excessive interest is foolish.If someone finds themselves caught in such a situation—by their own words of promise (Proverbs 6:2)—they should try to extricate themselves by humbly asking to be released from the obligation. Solomon puts a sense of urgency on this idea: recommending one act immediately to get out of the situation and beg urgently to be released from the obligation.
In this context, "your neighbor" refers to the first signer of the loan: the actual borrower. The word "neighbor" appears in verse 1 as the person for whom the cosigner agrees to attach his name to the loan. Instead of berating the neighbor for his failure to pay, it is best to withhold one's anger and humbly plead with him to pay his debt and free you from your part in it. If the cosigner insults the first signer, he may make him angry and unwilling to oblige. This action is hard to take, but it is much harder to fall prey to a money-hungry lender and forfeit one's property as payment of the loan.