verb
to inform on or betray someone, especially to the authorities
-
He threatened to rat out his colleagues if they didn't confess to their wrongdoings.
-
I can't believe you're going to rat me out to the teacher for skipping class.
-
Don't be a snitch and rat out your friends for breaking the rules.
-
She felt like her own mind was trying to rat her out by revealing her deepest fears.