to make something quickly without special care or preparation

I had to throw dinner together at the last minute. 我只好在最后一分钟赶紧做了一顿饭。

If two people are thrown together, they meet each other in a way that was not planned, or events cause them to meet unexpectedly.

We were thrown together by chance at a conference. 我们是在一次会上偶然相识的。