drop one's guard;be careless and unconcerned;lack of vigilance;be off one's guard ;

Don't you know the crushed worm will turn ? Why are you so lacking in vigilance?
你不知道困兽犹斗 吗 ?为什么这样麻痹大意?
来源:《现代汉英综合大词典》If lowers oneguard from examines for hemorrhoids, very possibly breeds the big trouble.
如果麻痹大意地自诊为痔疮, 就很可能酿成大患.
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