If people hang together, they help each other and work together to achieve something.

If the opposition party can hang together over the next six months, they might just stand a chance of being elected. 如果反对党在今后的6个月里能团结一致，他们可能有机会在选举中获胜。

If the parts of something hang together, they are well organized or they seem to be true or correct.

Somehow her story doesn't quite hang together. 不知为什么，她的故事听起来不像是真的。