Put up or shut up
Definition 1 of 1
Pro Tip 1/3Challenge Issued
Used to throw down a gauntlet, requesting action rather than words. 
During the debate, the candidate said to his opponent, 'It's time to put up or shut up about your plans.'
Pro Tip 2/3Confrontational Tone
Implies frustration or impatience with someone's inaction or empty bragging. 
Stop boasting about beating me at chess and put up or shut up!
Pro Tip 3/3Informal Context
Appropriate in casual situations among friends or in sports, not in formal settings. 
At the poker game, he was challenged to 'put up or shut up' as the stakes rose.