crush:  The emergence of crush is something of a mystery. English borrowed it from Old French croissir, but it is not clear where Old French got it from. Some consider it to be of Romance origin, postulating a hypothetical Vulgar Latin *cruscīre to account for it, but others suggest that Old French may have borrowed it from Germanic, pointing to the similarity of Middle Low German krossen ‘crush’.
mid-14c., from Old French cruissir (Modern French écraser), variant of croissir "to gnash (teeth), crash, break," perhaps from Frankish *krostjan "to gnash" (cognates: Gothic kriustan, Old Swedish krysta "to gnash"). Figurative sense of "to humiliate, demoralize" is c. 1600. Related: Crushed; crushing. Italian crosciare, Catalan cruxir, Spanish crujirare "to crack" are Germanic loan-words.