1
general::
Phrase(s): It’s on me.
I will pay this bill. (Usually a bill for a meal or drinks. Compare this with This one’s on me.) • As the waiter set down the glasses, Fred said, "It’s on me," and grabbed the check. • John: Check, please. Bill: No, it’s on me this time.
McGrawhill's American Idioms And Phrasal Verbs