also: すみ
noun, used as a suffix, noun
done; finished; completed; settled
Attached to nouns to mean that the action has been completed or the matter is settled. The reading is ずみ when used as a suffix.
この書類は確認済みです。
This document has been checked.
支払い済みの領収書をください。
Please give me a receipt showing payment has been made.
Irregular okurigana usage; less common than 済み.
済む is a verb meaning 'to finish' or 'to be settled', while 済み is a suffix attached to nouns to indicate completion.
Derived from the verb 済む (すむ, 'to finish, be settled'), with the suffix form undergoing rendaku to ずみ.