Re-paying, a term used to describe the act of returning money borrowed, can have several antonyms. The opposite or antonym of repay could be 'borrow,' 'give,' 'lend,' or 'donate.' To borrow means to take money from someone with the understanding of returning it at some point in the future. Giving means willingly providing money or something valuable without any expectation of getting it back. Lending is the act of providing money, which is to be returned with interest, while donating means offering money or possessions without any expectation of compensation. Thus, repaying money is the opposite of borrowing, giving, lending, and donating.