English · Phrasal verb Attested

grass up

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

Bắt đầu thông báo để phản bội

Machine-translated — suggest a fix

My sister grassed me up to the caretaker! She thought she was doing me a favour — by grassing me up she was sure he'd let me off.

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 up” mean?

To betray by informing on.

Is “grass up” formal or informal?

grass up is generally slang.

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