grass
noun, verbInformal
A British English slang term. Browse all British slang.
What it means
An informer; someone who reports others to the authorities.
To inform on someone. Usually grass someone up.
In use
Nobody likes a grass.
She grassed him up to the manager.
Where it comes from
Most often traced to rhyming slang — grasshopper for 'copper' — though the chain is disputed and the word may simply come from the idea of a snake in the grass.
Other forms
- Similar terms:
- snitch