keep back 英[ki:p bæk] 美[kip bæk]

[词典] 隐瞒; 扣留; 阻止…前进; 留在后面

hold back常表示下列意义：

1) 阻碍,阻止

He was so angry at the news that I couldn’t hold him back.

2) 妨碍进展

Do you think that mixed ability classes hold back the better students?