Similar words: draft horse, cart horse, horse, sawhorse, one-horse, sea horse, horseman, warhorse. Meaning: n. a gift (usually of inferior quality) that should be accepted uncritically.
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1. Never look a gift horse in the mouth. 
2. I'm never one to look a gift horse in the mouth.
3. But never one to look a gift horse in the mouth, I say, be gracious and accept this delightful offering.
4. Look a gift horse in the mouth.
5. Never look gift horse in the mouth.
6. Don't look a gift horse in the mouth.
7. Some experts wonder why Petrie's is looking a gift horse in the mouth.
8. That villain of a landlord was not the one to look a gift horse in the mouth.
9. It was one of mother's maxims never to look a gift horse in the mouth.
More similar words: draft horse, cart horse, horse, sawhorse, one-horse, sea horse, horseman, warhorse, horsefly, seahorse, if the worst comes to the worst, horsehair, horseplay, horseshit, horseshoe, horsetail, race horse, male horse, racehorse, horseback, horse race, packhorse, dead horse, workhorse, wild horse, dark horse, high horse, horseless, horse cart, horse-drawn.