sell out

noun
A person who is noted for telling on other people

verb
to sell out

past tense
sold out

This guy is a sell out. It is no wonder he has difficulty forming lasting friendships.

The student is known for selling others out to the faculty officers for various things such as smoking near the academic buildings.

He sold out a cadet for taking his book bag and hiding it behind the bushes in front of the barracks.

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