grass on

Verb

UK slang

(UK, slang) To betray by informing on.

Japanese Meaning

（スラング）密告する、告げ口する、裏切る

Even when the police came, she refused to grass on her colleagues.

警察が来ても、彼女は同僚を密告することを拒んだ。

Sense（1）

(UK, slang) 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.

grasses on

（ present singular third-person ）

grassing on

（ participle present ）

grassed on

（ participle past ）

grassed on

（ past ）