go off at half cock 仓促行事；草率行事；因冒失而坏事；发火；操之过急

【例句】
Jane was thinking about quitting her present job, but I advised her not to go off at half cock.
简打算辞去现职，但我劝她不要仓促行事。

My boss went off at half cock and shouted at his secretary for being late.
我的老板很恼火，他对迟到的秘书大喊大叫。