to work hard as a group in order to achieve something

We don't have much time but if we all pull together we should get the job done. 我们没有多少时间了，但如果齐心协力的话应该能完成任务。

to manage with difficulty to collect enough money, information, etc. to produce a result

If you can pull together sufficient funding, we are prepared to approve the project. 如果你能筹集到足够资金，我们愿意批准这个项目。

They somehow managed to pull together a plan of action. 他们想办法制定出了一个行动方案。

to become calm and behave normally again after being angry or upset

Just pull yourself together. There's no point crying about it. 要控制自己的情绪，没必要为了那件事哭。