potshot

1. N-COUNT To take a potshot at someone or something means to shoot at them without taking the time to aim carefully. 胡乱射击[非正式]

2. N-COUNT A potshot is a criticism of someone that may be unexpected and unfair. 乱批评; 突然而不公正的批评[非正式]

...Republicans taking potshots at the president. ...共和党人胡乱批评总统。