cover

A cover refers to something that provides protection or shelter, usually to shield or conceal something beneath it.

• The roof serves as a cover for the entire house. — 屋根は家全体のカバーとして機能します。
• The book needs a protective cover to keep it safe. — 本は安全に保つために保護カバーが必要です。

To cover means to shield or enclose something in order to protect or conceal it from view.

• Please cover the child with a blanket to keep warm. — 子供を温かく保つために毛布でカバーしてください。
• He used his jacket to cover the sleeping dog from the rain. — 彼は寝ている犬を雨からカバーするためにジャケットを使った。

When something is described as cover, it indicates that it is hidden or concealed from sight.

• The treasure was buried in a covered location, ensuring its safety. — 宝物は隠された場所に埋められ、安全が確保されていた。
• The covert operation was conducted under the cover of darkness. — その隠密作戦は暗闇のカバーの下で行われた。