keep back

keep back 保留某物的一部分，阻止感情等的流露，隐瞒

【例句】

◆ Keep back some money for those who are in need of it．保留一部分钱给那些需要用钱的人。 

◆ At the moment she couldn't keep back her tears．这时她没法忍住自己的泪水。