"Cry off" is an idiomatic expression that means to cancel a previously agreed appointment or event due to illness or other unforeseen circumstance. The opposite of this phrase would be to "follow through" with the appointment or event as planned. Other antonyms for "cry off" could include "show up," "appear," or "attend," as all of these terms suggest that the individual is fulfilling their commitment rather than backing out. Additionally, "honor," "uphold," and "fulfill" could also be considered antonyms for "cry off" since they all denote a sense of responsibility and accountability in following through with commitments.