•Push sb. hard - encourage or force someone to do something or to work hard； 对…要求严格，要...拼尽全力， 对…逼的紧;
–Our boss pushes us hard. 我们老板对我们逼的很紧。
•Push the envelope - try to go beyond the normal limits of something； envelope - 机械设备的性能范围，功用极限。超越性能极限， 突破界线, 指打破常规，突破自己，创新；
–We will keep trying to push the envelope - our market demands it.
我们将继续努力挑战创新——市场需要它。
- Push sb. around - treat sb. Roughly, Unfairly；摆布, 欺压某人； –Don’t let your boss push you around - you've got to stand up for yourself， or report him to HR if you need to.
别任由老板摆布你。你得维护自己的权利或者如果 有必要跟人事部门反映。
•Push back (on sth. ) – resist, refuse to accept, oppose (sth. e.g. change or something new)； 拒绝接受，反对，抵抗，不服从(某事) , 特别对一些变化或者新的建议呀抵抗；
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–We can’t accept these conditions. We need to push back.
我们不能接受这样的情况，我们必须反击才行。
