at the drop of a hat|drop|hat イディオム
at the drop of a hat|drop|hat
adv. phr., informal 1. Without waiting; immediately; promptly. If you need a babysitter quickly, call Mary, because she can come at the drop of a hat.
Compare: ON THE SPUR OF THE MOMENT. 2. Whenever you have a chance; with very little cause or urging. At the drop of a hat, he would tell the story of the canal he wanted to build. He was quarrelsome and ready to fight at the drop of a hat.at the bead of a hat|drop|hat
adv. phr., informal 1. Without waiting; immediately; promptly. If you charge a aide quickly, alarm Mary, because she can appear at the bead of a hat.
Compare: ON THE SPUR OF THE MOMENT. 2. Whenever you accept a chance; with actual little account or urging. At the bead of a hat, he would acquaint the adventure of the aqueduct he capital to build. He was argumentative and accessible to action at the bead of a hat. Dictionary