come up with和catch up with 有什么区别

come up with
1.赶上；接近,走近：
I came up with them as they were rounding the corner.
他们正在拐弯时,我赶上了他们.
2.提出,提议：
We weren't able to come up with any new suggestions.
我们提不出任何新建议.
catch up with：赶上,追上；逮捕；处罚