to cause sb.to remain awake and out of bed不让某人上床睡觉
e.g.I hope I'm not keeping you up.
在这里纠正一下keep sth. up是继续做某事
e.g.She started screaming with rage ,but I knew she wouldn't keep it up for long.
keep up with sb.跟上某人，同某人保持同一水平
e.g.I ran as fast as I could,butI couldn't keep up with the others.
keep in touch with sb.与某人保持联系
一般是用在朋友追女孩时，叫他坚持下去的意思。
是搀扶的意思。
keep up和...保持联系
鼓励某人坚持下去
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