Definition of look a gift horse in the mouth in US English:

look a gift horse in the mouth

phrase

  • usually with negative Find fault with something that has been received as a gift or favor.

    ‘they did not look the gift horse in the mouth when the opportunity for victory presented itself’
    • ‘Ah well, don't look a gift horse in the mouth, right?’
    • ‘I doubt whether there are any famous people or people of high standing living in the community, so don't look a gift horse in the mouth and grab this golden opportunity while it is still there.’