a rat in a hole不是洞中之鼠而是瓮中之鳖。

【例句】
Saddam was caught like a rat in a hole.
萨达姆已成瓮中之鳖被捉。

He is going to live like a rat in a hole. What for? They are so cruel.
他将如瓮中之鳖一样生活了。这是为什么？他们太残酷了。