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Rat on Meaning in English

expression

ˈɹæt/ /ˈɑn/, /ˈɔn
RAT-on
ɹˈæt/ /ˈɒn
RAT-on

Definition

To tell someone in authority about another person's wrongdoing or secrets, often betraying their trust.

Usage & Nuances

Informal and slangy, often negative; implies betrayal or being a 'snitch.' Common with 'on someone' (e.g., 'rat on your friend'). Not used for reporting serious crimes officially.

Example Sentences

Don't rat on your brother to your parents.

basic

He promised not to rat on his classmates.

basic

If you rat on me, I won't forgive you.

basic

Nobody likes someone who always rats on their friends.

natural

She didn't want to rat on her coworker, even though she knew he was wrong.

natural

After he ratted on the group, no one trusted him anymore.

natural