warn

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To caution or admonish (someone) against unwise or unacceptable behaviour

• I wanted to warn you.

  Я хотел тебя предупредить.

  Tatoeba · CK · CC BY 2.0 FR

• Why didn't Tom warn us?

  Почему Том не предупредил нас?

  Tatoeba · CK · CC BY 2.0 FR

предостерега́ть

To make (someone) aware of impending danger, evil, etc — To make (someone) aware of (something impending); especially

предостерега́ть

To notify or inform (someone, about something) — To make (someone) aware of (something impending); especially

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To advise or order to go or stay away

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To give warning

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To summon (someone) to or inform of a formal meeting or duty — To make (someone) aware of (something impending); especiallyредкое

предостерега́ть

To make a sound (e.g. clicking or whirring) indicating that it is about to strike or chime (an hour) — To make (someone) aware of (something impending); especiallyредкое