1. 约束,抑制：hold down 压制;抑制(热情等) | hold in 约束,抑制 | hold office 担任公职

2. 轻视,认为-不屑一顾：contempt n 轻视 | hold in- 轻视,认为-不屑一顾 | contend vi 搏斗,争斗;争夺,竞争vt 声称,主张

3. hold in的解释

3. 约束：hold in scorn 蔑视 | hold in 约束 | hold loose 漠然置之

4. 保持同步：hold-in range 同步带 | hold-in 保持同步 | hold-lantern 货舱灯

1. 压抑，克制（感情、情绪等）
    If you hold in an emotion or feeling, you do not allow yourself to express it, often making it more difficult to deal with.

    e.g. Depression can be traced to holding in anger...
           抑郁症可以追溯到对愤怒情绪的压抑。
    e.g. Go ahead and cry. Don''t hold it in.
           只管哭吧。别忍着。