Fall through is a phrase used to indicate the failure of a plan, idea, or agreement. Synonyms for fall through include collapse, crumble, disintegrate, fail, flop, flounder, founder, miscarry, peter out, and come to naught. When a plan or an agreement fails, it may lead to frustration, disappointment, or embarrassment. It is important to prepare for the possibility of a fall-through by having a contingency plan in place or by carefully considering all the factors that could cause the plan's failure. Using synonyms for fall through, like collapse or miscarry, can help you effectively communicate the situation to others while avoiding any confusion or misunderstanding.