The harm has occurred, and nothing can be done to prevent it now; it might have been preventable, but cannot be prevented retroactively.

(dated) Thoroughly deceived, cheated, or fooled.

past participle of do business

(colloquial, obsolete) Worn-out, exhausted.

(idiomatic) An agreement that has been finally resolved or decided.

(Britain, idiomatic, of a task) Completed thoroughly and satisfactorily.

past participle of do time

(humorous, emphatic) Done: past participle of do, indicating a passive voice.

(chiefly UK) Something done habitually or according to social norms, expectations, etc.

Used to indicate an intent to fulfil a request or order promptly.