The phrase "making off with" refers to a situation in which something is stolen or taken away by force. Therefore, its antonyms would be words or phrases that describe returning, giving back, or relinquishing. Some possible antonyms for "making off with" include "giving back," "returning," "handing over," "restituting," "restoring," "surrendering," "yielding," "submitting," "redepositing," and "replacing." These antonyms all describe the act of giving something back, rather than stealing or taking it away. They convey a sense of honesty, responsibility, and accountability, which is the opposite of the selfishness and deceit that are associated with "making off with" something.