hold up和hold back的区别为：意思不同、用法不同、侧重点不同。
一、意思不同
1、hold up：站得住脚，成立。
例句：
Why were you holding everyone up?
你为什么耽搁了大家？
2、hold back：（使）退缩，阻挡。
例句：
You seem to be holding something back.
你好像隐瞒了点什么。
二、用法不同
1、hold up：基本意思是“向上动”“从低处向高处上升”，可指不太费力地将物体举向高处或将其从较低的平面移至较高的平面，也可指把某物垂直竖起来(即一头着地)。
例句：
Hold it up so that we can see it.
把它举起来让我们看看。
2、hold back：基本意思是“阻碍或妨碍某人或某物行动”，常指拖延人或事，强调使速度或进程缓慢下来。
例句：
The administration had several reasons for holding back.
政府因为几个原因而犹豫不决。
三、侧重点不同
1、hold up：有主动性，暴力性。
2、hold back：有被动的感觉。
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第1个回答 2013-05-03
hold up 举起；支撑；耽搁；持械抢劫
hold back 隐瞒；控制；阻碍；犹豫不决
hold back 隐瞒；控制；阻碍；犹豫不决
第2个回答 推荐于2018-02-24
hold up指用暴力或武力威胁抢劫，有明确目的
hold back扣住，保留抑制的意思
1. hold up常表示下列意义：
1) 延迟，阻碍
My application was held up by the postal strike.
2) 搀扶；支撑；举起；抬起
He held up his hand to agree to the plan.
3) 举出（例子）；提出（作为榜样）
She is always holding up her children as models of good behavior.
4) 支持住；承受住；支撑得住
She’s holding up well under the pressure.
2. 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?本回答被提问者和网友采纳
hold back扣住，保留抑制的意思
1. hold up常表示下列意义：
1) 延迟，阻碍
My application was held up by the postal strike.
2) 搀扶；支撑；举起；抬起
He held up his hand to agree to the plan.
3) 举出（例子）；提出（作为榜样）
She is always holding up her children as models of good behavior.
4) 支持住；承受住；支撑得住
She’s holding up well under the pressure.
2. 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?本回答被提问者和网友采纳