Meaning

noun an acrobatic feat of rolling or turning end over end

noun a sudden drop from an upright position

verb fall down, as if collapsing

originFrom Middle English tumblen (“to fall over and over again, tumble”), frequentative of Middle English tumben (“to fall, leap, dance”), from Old English tumbian, from Proto-Germanic *tūmōną (“to turn, rotate”). Cognate with Middle Dutch tumelen (whence Dutch tuimelen), Middle Low German tumelen, tummelen, German taumeln and Danish tumle.

Etymology from Wiktionary, CC BY-SA 3.0