Oxford Advanced American Dictionary

Definition of done adjective from the Oxford Advanced Learner's Dictionary

done

adjective
done pronunciation English dʌn done pronunciation American dʌn
 
see also do verb
[not before noun]1 finished; completedWhen you're done, perhaps I can say something.done with I'll be glad when this job is over and done with.2 (of food) cooked enoughThe meat isn't quite done yet.3 (British English) socially acceptable, especially among people who have a strict set of social rulesAt school, it simply wasn't done to show that you cared for anything except cricket.
Idioms

be done for

(informal) to be in a very bad situation; to be certain to failUnless we start making some sales, we're done for.When he pointed the gun at me, I thought I was done for (= about to die).

be/get done for something/for doing something

(British English, informal) to be caught and punished for doing something illegal but not too seriousI got done for speeding on my way back.

be done in

(informal) to be extremely tired
Synonym
be exhausted

be the done thing

(British English) to be socially acceptable behaviour

be/have done with something

to have finished dealing with somebody, or doing or using something
If you've done with that magazine, can I have a look at it?

a done deal

an agreement or a plan that has been finally completed or agreed
The merger is by no means a done deal yet.

done and dusted

(British English, informal) completely finishedThat's my article for the magazine done and dusted.

have done with it

(British English) to do something unpleasant as quickly as possible, so that it is finishedWhy not tell her you're quitting and have done with it?
 more at easier said than done at easy adverb, be/feel hard done by at hard adverb, no sooner said than done at soon