Answer: upending

AnswerCrossword Clue
UPENDINGToppling over
UPENDINGTurning upside down
UPENDINGToppling
UPENDINGAffecting radically
upendingSet or turn (something) on its end or upside down
upending(of a swimming duck or other waterbird) Submerge the head and foreparts in order to feed, so that the tail is raised in the air
upendingUPEND, to turn upside down