Street
grass up
What does grass up mean?
To report or betray another person to the authorities.
"Someone grassed him up over the phone in his pad."
Origin
From 'grass' (informer) + 'up'.
Frequently asked questions
What does 'grass up' mean?
It means to report or betray someone to the authorities, such as informing on a fellow prisoner or a criminal associate.
Where does 'grass up' come from?
It is built from 'grass', British slang for an informer, plus 'up'. To grass someone up is to inform on them.
Is being called a grass serious inside?
Yes. Informing is one of the most despised acts in prison culture, and being branded a grass can put someone at real risk of violence.
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