The Oxford Thesaurus An A-Z Dictionary of Synonyms - thrashing n.

1) beating, drubbing, whipping, flogging, assault, caning, belting, mauling, lashing, trouncing, basting, battering, pounding, Colloq hiding, tanning, lambasting, hammering, pasting: Every time he stepped into the ring he got a thrashing. 2) punishment, chastisement, disciplining, discipline, castigation: He dreaded the thrashing his father administered at any sign of disobedience.