hold in
1．control or restrain控制；抑制
Your horse is going too fast；you must hold it in．你的马跑得太快 了，你得勒住些。
My mother is good at holding in her emotions．我母亲很善于克制 自己的感情。
2．contain oneself； exercise restraint忍耐；克制自己
He was raging inside，but held himself in for fear of saying something he would regret．
他内心 很生气，不过他忍着，生怕说出他 会后悔的话。
He wanted to speak up but thought better of it and held in．他真想开 口说话，但仔细想想还是忍住了。