I tell a lie idiom mainly UK      
 (用于纠正刚刚说过的话)我说错了
something you say when you have just said something wrong and want to correct it
  Her name is Paula, no, I tell a lie (= I'm wrong) - it's Pauline. 她的名字叫葆拉,哦,不对——叫保利娜。 
 
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