瓮中之鳖wèng zhōng zhī biē

处于瓮罐内的鳖。比喻形势对一方极有利，另一方则处在受制地位。

例敌人已成瓮中之鳖，我军稳操胜券。

英be bottled up like a turtle trapped in a jar; be hopeless like a rat in a hole;