thrash ‧ ing /ˈθræʃɪŋ/ BrE AmE noun [countable] especially British English
1 . an occasion when you beat someone or are beaten violently as a punishment:
If you speak to your mother like that again, you’ll get a thrashing.
I’ll give you the thrashing you deserve.
2 . informal an occasion when you defeat someone or are defeated very easily in a game:
The manager resigned after his team’s 14–0 thrashing.