Thrash
a swimming kick used while treading water
Synonyms
bang about, bang around, Bash, bash about, bash around, Bat, Beat, beat black and blue, beat up, belabor, belabour, clobber, convulse, cream, drub, duff up, flagellate, flail, flog, flounder, give a beating, give a hiding, give a licking, give a thrashing, grapple, Hit, jactitate,