1. C 大老鼠　a long-tailed animal related to but larger than the mouse
2. C 卑鄙小人，叛徒　a worthless disloyal person

　catch a ～　捕鼠
　get rid of ～s　消灭老鼠
　smell a ～　怀疑其中有诈
　brown ～　棕色鼠
　dirty ～　卑鄙的人
　the water ～　水鼠
　like a ～ in a hole　像瓮中之鳖，很有把握
　like a drowned ～　（淋得）像落汤鸡，浑身湿透

　The rats have eaten holes in those bags of flour.　大老鼠把那些面粉袋嗑出了窟窿。
　He looks like a drowned rat.　他看上去像一只落汤鸡，全身都湿透了。
　But you promised to help us, you rat!　可是你答应过要帮我们的忙，你这言而无信的小人！

 ♣ rat, mouse
　参见mouse条。

1. vi.捕鼠　 hunt rat
2. vi.变节；食言；叛变　 break an agreement, a promise, etc.; fail to do sth one has undertaken to do; betray sb

　～ on　密告…
　～ on one's friends　背叛朋友

　The dogs went ratting.　狗都去捕捉老鼠了。
　They said they'd help us but they've ratted.　他们答应帮助我们，但他们食言了。

 ♣ rat on　(v.+prep.)
　〈口〉背叛，告发；食言 betray or inform on (sb); go back on (sth)
　That coward ratted on his fellow-workers.　那个胆小鬼告发了和他一起干活的工人。
　The police know we're here. Someone must have ratted on us.　警察知道我们在这儿，一定是有人背叛了我们。
　We shouldn't rat on our promise.　我们不应该违背诺言。

　［同义词］ n. mouse
　［词源］古英语ræt（鼠）