alert

注意深い、警戒している

意識がはっきりして注意を払い、変化に気づいたり対応したりできる。

やさしい英語で： Awake and paying close attention, ready to notice or respond to something.

• Coffee helps me stay alert.
• The dog remained alert all night.
• She was alert to every small sound.

使い方： alert to something (Drivers must be alert to sudden changes in traffic.)

類義語： attentive, watchful, vigilant

反対語： inattentive, drowsy

よく使う表現： stay alert, fully alert, alert to danger

通知、お知らせ

重要な情報や変化に注意を向けさせるメッセージ。

やさしい英語で： A message that draws your attention to important information or a change.

• My phone showed a news alert.
• You can receive alerts when prices change.
• I turned off email alerts during the meeting.

類義語： notification, notice

よく使う表現： email alert, news alert, receive an alert

警報、警告

危険や問題が近い可能性を知らせる警告。音や合図で伝えることが多い。

やさしい英語で： A warning that danger or trouble may be near, often given by a sound or signal.

• A fire alert woke us.
• Officials issued an alert about rising river levels.
• The system sounds an alert when smoke appears.

類義語： warning, alarm

よく使う表現： fire alert, sound an alert, flood alert

警戒態勢、即応態勢

軍がすぐに行動や戦闘を始められるよう準備している状態。

やさしい英語で： A state in which military forces are ready to act or fight at short notice.

• The soldiers are on alert.
• Enemy movements prompted a higher state of alert.
• Several aircraft remained on airborne alert overnight.

使い方： on alert (The troops remained on alert near the border.); put someone on alert (The commander put all units on alert.)

類義語： readiness

よく使う表現： on alert, high alert, airborne alert

警告する、知らせる

危険や問題、注意すべき重要な事実を人に伝える。

やさしい英語で： To tell someone about a danger, problem, or important fact they need to notice.

• Please alert the police.
• A neighbor alerted us to the fire.
• The app alerts users when their account balance is low.

使い方： alert someone to something (She alerted us to a problem with the heating.); alert someone that… (The message alerted staff that the building was unsafe.)

類義語： warn, notify, inform

よく使う表現： alert the police, alert someone to, alert staff