biff biff /ˈbɪf/

noun

1. [Informal] (boxing) a blow with the fist  ( biff [Informal] , clout , lick , poke , punch , slug )
   (boxing) a blow with the fist
    I gave him a clout on his nose
   I gave him a clout on his nose
   
   

verb

1. [Informal] Strike, usually with the fist  ( biff [Informal] , pommel , pummel )
   strike, usually with the fist
    The pedestrians pummeled the demonstrators
   The pedestrians pummeled the demonstrators