What does the idiom to coin a phrase mean?

The idiom "to coin a phrase" means to create a new or original expression. It's often used when someone is introducing a new phrase or saying something in a particularly creative way.

Here's how it's used:

* "I'm feeling a bit under the weather, to coin a phrase." (This implies that "under the weather" is a well-known phrase, but the speaker is using it slightly ironically.)

* "He's a real go-getter, to coin a phrase." (This implies that "go-getter" is a common phrase, but the speaker is using it with emphasis.)

It's important to note that the idiom itself is a bit ironic. The phrase "to coin a phrase" is actually quite common, so it's technically not a newly coined phrase. But it's used to highlight the speaker's creativity or emphasize a particular point.