that's one on me

Idioms & Phrases

that's one on me

That's a joke at my expense, as in And after all that discussion they didn't show upthat's one on me. This phrase must be distinguished from that's a new one on me, which means "this is the first time I've heard of or seen that" (as in A checkerboard rugthat's a new one on me). Both idioms can be used with other personal pronouns (for example, that's one on you) and date from the early 1900s.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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