get

1. I need all the sleep I can get.
2. Get another chair.
3. I'll get the door.
4. Get her!
5. You'll get used to it?
6. The cat got drowned.
7. They got her to sign the consent form.
8. You don't want to get into debt.

Please, tell the meaning of sentences stated above. I tried to find out the meaning of those sentences with the help of dictionary, but I failed.

Thanks to everyone.