临阵脱逃 línzhèn-tuōtáo

(1) [flee before battlebegins;run away on going into war;desert on the eve of a battle; turn the corner]∶军人逃离战场。比喻遇事畏缩不前

(2) [bugout]∶指在枪林弹雨中潜逃

不是半途溃散,便是临阵脱逃。——清·佚名《官场维新记》