a sledgehammer to crack a nut idiom UK disapproving
杀鸡用牛刀；小题大做
If you use a sledgehammer to crack a nut, you use much more force than is needed.
50 police officers to arrest two unarmed men is surely using a sledgehammer to crack a nut. 出动50名警察逮捕两个手无寸铁的人，这可真是小题大做。