overplay one's hand
idiom
: to make a mistake due to the belief that one's position is stronger or better than it really is
The union overplayed its hand by demanding too much, causing the company to withdraw what would have been its best offer.
With her biggest booster abandoning her after she flipped out as Congress passed a massive $95 million foreign aid package despite her threats, Rep. Marjorie Taylor Greene (R-GA) appears to have overplayed her hand — and set in motion the end of her reign of terror in the House.
perebor