The phrase "let fall between the cracks" refers to something being missed or overlooked, resulting in a negative consequence. Antonyms for this phrase could include "catch," "recognize," "address," "notice," or "attend to." By reversing the meaning of the original phrase, these antonyms suggest that the problem in question is being actively addressed and not ignored. For example, if a student's performance is in danger of falling between the cracks, a teacher may take steps to catch and address any issues before they become a serious problem. Similarly, if an important task is in danger of being overlooked, taking the time to notice and attend to it can prevent negative consequences.