A: Why were you looking in my locker? B: We were tipped ...
Don't worry. We will not tell on you.
A: Why were you looking in my locker? B: We were tipped off by a concerned parent that you might have drugs in your locker.
A: Why are you closing your store next month? B: My store is not legal, and someone ratted me out. A government inspect came and asked me to shut down the store.
When we were doing drugs, someone ratted us out. Then the police came and took us to the police station.
Snitching on tax cheats isn't always lucrative, but whistleblowers do it anyway because there is no loss for them.
He didn't file for tax return and his wife ratted on him.
A: You told on me to the pastor? B: Yes I did. You did an unneighborly thing and I needed to let him know.
Missy: If you rat me out to dad, I'll rat you out to mom. Georgie: Who are you, the devil?
[1] tell on Y to X[2] tattle on Y to X[3] to tip off[4] rat somebody out[5] snitch on somebody[6] rat on somebody[7] squeal on somebody[8] narc somebody out