I had to restrain myself from shouting at him.

restrain 是动词，由前缀 re-（表示“回、向后”）和 strain（拉紧、用力）组成，字面意思是“往回拉”，引申为“克制、抑制、阻止”。restrain oneself 表示“控制住自己（不做某事）”。