Noun
a gift (usually of inferior quality) that should be accepted uncritically
Source: WordNetLife is a gift horse in my opinion. J. D. Salinger
Never look a gift horse in the mouth. Jerome
On the other hand it was bad manners to look a gift horse in the mouth. Even if you're getting it from an overweight cracker in a fringe shirt. Ilona Andrews
They don't count the teeth of a gift horse. Persian Proverb
One doesn't examine the teeth of a gift horse. Portuguese Proverb
Don't look a gift horse in the mouth. English Proverb