use a sledgehammer to crack a nut UK /ˌjuːz‿ə ˈslɛd͡ʒhæmə tə ˌkɹæk‿ə ˈnʌt/US /ˌjuz‿ə ˈslɛd͡ʒhæmɚ tə ˌkɹæk‿ə ˈnʌt/ verb1 •(UK, informal) To use disproportionate or significantly excessive force to carry out an action; to do something overzealously.Today, Mr [Anthony] Worthington, an engineer, said: 'Sending three officers over simply to give a warning about kids playing football in the street is like using a sledgehammer to crack a nut.[…]' — 2010 formsused a sledgehammer to crack a nut · using a sledgehammer to crack a nut · uses a sledgehammer to crack a nut