grass
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
To act as a grass or informer, to betray; to report on (criminals etc) to the authorities.
Register: slang
Where it’s used:
Used
American English
Examples
"Grassed on me he did," I said morosely. (Note: Grass is English thief slang for inform.)^([sic])
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” mean?
To act as a grass or informer, to betray; to report on (criminals etc) to the authorities.
Is “grass” formal or informal?
grass is generally slang.