1. Home
2. Idioms
3. This one is on

This one is on

---

---

This one is on someone

the cost of this drink or meal will be paid by the person named or designated. A: Should we ask for separate checks or what? B: No, no, this one's on the boss! As the waiter set down the glasses, Fred said, "This one's on me."

See also: on, one, this