grass on

listen to the pronunciation of grass on
English - Turkish
(Konuşma Dili) ispiyonlamak
Polise suç ihbarında bulunmak
English - English
To betray by informing on

What I was pissed off about, though, was him telling everyone that he'd only grassed on me because I'd grassed on him first, which was a total lie.

(British informal) inform the police of criminal activity or plans
grass on
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