reveal a secret carelessly or by mistake （无意中）泄露秘密; 露马脚: I wanted mother's present to be a secret, but my sister let the cat out of the bag. 给母亲的礼物我原想保密, 可是妹妹却露了马脚. like a ,cat on hot `bricks (infml 口) very nervous 非常紧张; 像热锅上的蚂蚁; 如坐针毡: He was like a cat on hot bricks before his driving test. 他面临驾驶考试, 紧张得像热锅上的蚂蚁. no room to swing a cat => room. play cat and mouse/play a cat-and-mouse game with sb (infml 口) keep sb in a state of uncertain expectation, treating him alternately cruelly and kindly 对某人时好时坏、 忽冷忽热. put/set the `cat among the pigeons (infml 口) introduce sb/sth that is likely to cause trouble or disturbance 引来可能招惹是非或麻烦的人或事物: The new vicar's a Marxist that'll set the cat among the pigeons! 新来的牧师是马克思主义者--这下子可要鸡犬不宁了. rain cats and `dogs => rain2. wait for the cat to jump/to see which way the cat jumps => wait1.
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