gang up
US /ɡæŋ ʌp/
UK /ɡæŋ ʌp/

1.
mengeroyok, bersekongkol
to form a group to attack or oppose someone
:
•
The older kids used to gang up on him in the playground.
Anak-anak yang lebih tua dulu sering mengeroyok dia di taman bermain.
•
Don't let them gang up on you; stand your ground.
Jangan biarkan mereka mengeroyokmu; pertahankan posisimu.