behind someone's back
(mineralogy) A mineral form of potassium bicarbonate.
(zoology) Any of a number of swimming decapod crustaceans that clean other organisms of parasites.
a person who has returned to the country of origin or whose citizenship has been restored.
(idiomatic) Without somebody's knowledge; secretly.
彼らは数人のチームメンバーに知らせないままスケジュールを変更したため、何人かは会議に準備ができていませんでした。
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