1 to refuse to give some of the information that you have 有所隐瞒；保守秘密: The police are sure that she is holding something back. She knows much more than she is saying. 警方认为她必定隐瞒着什么，她知道的远远不止她说出来的事情。

2 to control an emotion and stop yourself from showing what you really feel 抑制，控制（感情）: He fought to hold back tears of anger and frustration. 他拚命忍住愤怒和沮丧的眼泪。