拡大する
解説 Definition
expanding は expand（拡大する、広げる）の動名詞・現在分詞で、「拡大している」「拡大すること」という意味です。範囲、事業、知識、場所などが大きく広がる場合に使います。
Expanding is the present participle and gerund of expand. It describes something becoming larger in size, range, area, or importance, an action that makes it larger, or the general activity of increasing something such as a business, city, or vocabulary.
覚え方のコツ Memory Tip
原形 expand に -ing をそのまま付けた現在分詞・動名詞です。文字を落としたり語末の子音を重ねたりせず、expanding とします。ex-「外へ」＋「広げる」という成り立ちを、風船や都市が外側へ広がる像に結び付けます。be expanding its business なら進行中、Expanding your vocabulary なら「広げること」を表します。
Add -ing directly to the base verb expand: expanding. No letter is dropped and the final consonant is not doubled. Link the word to expand’s central image of spreading outward. Picture a city spreading toward a river or a company increasing the reach of its online store. In “The company is expanding,” it is a present participle showing an action in progress. In “Expanding your vocabulary takes time,” it is a gerund naming the activity. Common objects such as business, knowledge, vocabulary, and operations help anchor its broad sense of growth.
例文
The company is expanding its online store.
その会社はオンライン店舗を拡大しています。
The city is expanding toward the river.
その都市は川の方へ拡大しています。
Expanding your vocabulary takes time.
語彙を増やすには時間がかかります。
expanding の類義語・関連語
expanding の語源・成り立ち Etymology
ラテン語 ex-（外へ）+ pandere（広げる）から成り「外へ広げる」が原義。pandere は「開く・伸ばす」の意味を持つ。関連語: pace（歩幅＝足を広げた距離）、passport（通行許可）も同根の passus に由来する。
Expanding is formed from expand by adding -ing directly, without dropping a letter or doubling the final consonant. Expand comes from Latin expandere, built from ex-, “out,” and pandere, “to spread or unfold.” Its literal image is therefore one of spreading outward. English uses this idea both physically, for a city or material growing larger, and figuratively, for increasing a business, range of knowledge, or vocabulary.
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