gang up on

physically attack as a group, verbally oppose as a group

several go against one, many fight one Three boys ganged up on Willie and knocked him down.

Synonyms and related words:
ambush, assail, assault, attack, blitz, bushwhack, come at, come down on, crack down on, descend on, descend upon, fall on, fall upon, go at, go for, harry, have at, hit, hit like lightning, jump, land on, lay at, lay hands on, lay into, light into, mug, pitch into, pounce upon, pound, sail into, set on, set upon, strike, surprise, swoop down on, take the offensive, wade into