crump /kɹʌmp/adjective 2noun 1verb 2forms 5 adjective2 •(dialect, UK) Hard or crusty; dry baked •(no longer used) Crooked; bent.Crooked backs and crump shoulders. — 1701 noun1 •The sound of a muffled explosion.Crump, crack! A shell exploded near them and the whole aircraft yawned to port as if somebody had punched it through the sky. — 1999 verb2 •To produce such a sound. •(US) To decline rapidly in health (but not as rapidly as crash).I can only be in one place at a time, so sometimes I just have to say, “Listen, I’ve got this other patient that’s crumping down the hall.[”] — 1998 formscrumped · crumping · crumps · more crump · most crump