Answer: crumping

AnswerCrossword Clue
crumpingCRUMP, to crunch (to chew with a crackling sound, also CRANCH, CRAUNCH)
crumpinglarge explosive shell or bomb
crumpingcrunching sound
crumpingto make a crunching sound, as in walking over snow, or as snow when trodden on
crumpingsudden ground movement in underground workings
crumpingto crunch or make a crunching sound, as with the teeth
crumping(of an artillery shell) to land and explode with a heavy, muffled sound