to start again; to continue 重新开始；继续
Let’s pick up where we left off yesterday.
咱们从昨天停下的地方继续吧。
to get better, stronger, etc.; to improve 改善；好转；增强
Trade usually picks up in the spring.
The wind is picking up now.
Sales have picked up 14% this year.
今年销售额增长了 14%。
to put things away and make things neat, especially for sb else （为某人）收拾，整理
All I seem to do is cook, wash and pick up after the kids.
烧饭、洗衣、跟在孩子屁股后头收拾东西，好像这就是我全部的活儿。