keep sth back
(a) prevent sth from moving; restrain sth 使某事物不能移动; 阻止某事物
Millions of gallons of water are kept back by the dam. 这个堤坝拦住了滔滔的洪水.
She was unable to keep back her tears. 她无法忍住泪水.
(b) not pay sth to sb 不将某物付给某人
A certain percentage of your salary is kept back by your employer as an insurance payment. 雇主扣下你部分薪金作保险金用. keep sth `back (from sb) refuse to tell sb sth; hold sth back 拒不将某事告诉某人; 隐瞒某事物
I´m sure she´s keeping something back (from us). 我肯定她(向我们)隐瞒 什麽. keep (sb) `back (from sb/sth) (cause sb to) remain at a distance from sb/sth (使某人)与某人[某事物]保持距离
Keep well back from the road. 离马路远些.
Barricades were erected to keep back the crowds. 设置了障碍以隔开人群.