grass
US /ɡræs/
UK /ɡræs/

1.
1.
balancer, dénoncer
(slang) to act as an informer, especially to the police
:
•
He threatened to grass on his accomplices if they didn't give him a bigger cut.
Il a menacé de balancer ses complices s'ils ne lui donnaient pas une plus grande part.
•
The police offered him a deal if he would grass on the gang leader.
La police lui a proposé un accord s'il voulait balancer le chef de gang.