1. don’t complain if a gift is not perfect; take what you've been given without criticism or emphasis on its worth

1. When Sandy complained about her present, her dad told her not to look a gift horse in the mouth.

2. I noticed the guitar wasn't made of real wood, but I didn't say anything because you shouldn't look a gift horse in the mouth.

3. You are too suspicious of Greg’s motives. If I were you, I would accept his gift graciously. Don’t look a gift horse in the mouth.