Everyone knows what not to do with a gift horse.

She is well past the point of looking any gift horse in the mouth.

And never, ever look a gift horse in the mouth.

How many big American companies would look a gift horse in the mouth?

But he wasn't about to look a gift horse in the mouth, as it were.

No, he wasn't going to look a gift horse in the mouth, not tonight.

But this is one gift horse the president may be looking in the mouth.

This is not a gift horse you have to look in the mouth of.

Well, I wasn't going to look a gift horse in the mouth.

Didn't want to look a gift horse in the mouth, I guess.