grounds
根拠
解説 Definition
grounds は ground（根拠、理由）の複数形で、「根拠」「理由」という意味です。判断や申し立ての支えとなる理由を表し、on the grounds that のような形でも使われます。
Grounds are facts, reasons, or circumstances that provide a sufficient basis for a decision, belief, request, or legal action. In this sense, the plural form is commonly followed by for, to, or a that-clause.
覚え方のコツ Memory Tip
原形 ground「地面・土台」の複数形で、子音や綴りを変えず -s を付け、語末は有声音なので /z/ と発音する。「主張を支える土台」から複数形 grounds が「根拠・理由」を表す。grounds for a decision、grounds to ask、on the grounds that をまとまりで覚え、庭園・敷地という別義とは文脈で区別する。
Begin with singular ground as firm land or a foundation. A reason supports a decision just as the ground supports a building, so plural grounds means the supporting reasons or evidence for something. It is formed regularly by adding -s to ground, pronounced /z/ after the final voiced sound. Learn the usual patterns: grounds for a decision, grounds to request a refund, and on the grounds that something is true. Context distinguishes this abstract sense from grounds meaning land surrounding a building or coffee grounds.
例文
We need clear grounds for this decision.
この決定には明確な根拠が必要です。
She had good grounds to ask for a refund.
彼女には返金を求める十分な理由がありました。
The manager explained the grounds for the new rule.
マネージャーは新しい規則の根拠を説明しました。
grounds の類義語・関連語
紛らわしい語
grounds の語源・成り立ち Etymology
古英語 grund（底、基盤）に由来し、ゲルマン祖語 *grunduz から派生。「地面→土台→根拠」と意味が拡張した。関連語：ground（地面）、grounded（地に足のついた）。建物の土台が論拠の比喩になった。
Ground comes from Old English grund, meaning the bottom, foundation, or surface of the earth, and is related to a Germanic word reconstructed as grunduz. The physical idea of a firm base developed metaphorically into the basis supporting an argument, belief, or action. Grounds is the regular plural of ground and became especially common for multiple or sufficient reasons, including reasons offered in legal and administrative contexts.
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