釜底游鱼 [- - - yú]a fish swimming in the bottom of a cauldron — a person whose fate is sealed; (like) a fish in the pot; a pretty kettle of fish swimming in the bottom of a cauldron; being very awkward and in confusion on the part of one's encircled enemies：
•¶ 敌军被我军重重包围， 已成为釜底游鱼。 Surrounded heavily by our troops, the enemy were like a fish in the pot.