English · Phrasal verb Attested

grass on

In real, traceable use. Part of the curated seed collection; community review is coming.

Both English Tiếng Việt

Meaning · English

To betray by informing on.

Nghĩa · Tiếng Việt

Phản bội bằng cách cung cấp thông tin

Machine-translated — suggest a fix

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.

Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)

Sources & notes

Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).

Common questions

What does “grass on” mean?

To betray by informing on.

Is “grass on” formal or informal?

grass on is generally slang.

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