Hi I'm trying to find a good definition of "conceit"

[Quartz]

@BigT

Though I do wonder if it’s starting to pick up some meaning from the similarly sounding (but etymologically unrelated) word “concede.” I’m pretty sure I’ve heard people use it as a synonym for “concession.” Confer the second-to-last example in the OP.

Umm… no. That’s nowhere near a concession. That comes under definition 7 in the OED: a fanciful, ingenious, or witty expression.