pop ; coup ; pounce
行动突然 sudden in one's action
他突然行动起来，说道：“咱们走！”
'Let's go!' he said, springing into action.
《牛津词典》
默斯利探员突然行动拿出对讲机。
AGENT MOSLEY snaps into action and pulls out his radio.
youdao
罗宾等人混入守备森严的郡长城堡，在执行吊刑时，他们突然行动，令敌人措手不及。
Robin et al gun guarded garrison into the castle long, hanging in the implementation, they suddenly action to the enemy by surprise.
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