also: づくめ
suffix
entirely; completely; nothing but
Suffix attached to nouns to mean 'entirely that thing' or 'nothing but that'. Often used in set phrases like 黒ずくめ (all black), いいことずくめ (nothing but good things), ごちそうずくめ (a feast of delicacies).
今日はいいことずくめの一日だった。
Today was a day of nothing but good things.
彼は黒ずくめの服装で現れた。
He showed up dressed entirely in black.
Kanji spelling is rare; kana is preferred.
Derived from the verb 尽くす (つくす, 'to exhaust, to use up'), with the suffix め. The exact derivation is uncertain, but it conveys the idea of being completely filled with or consisting of something.