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on guard

 

Definitions from WordNet

Adjective on guard has 1 sense
  1. on guard, on one's guard, upon one's guard, on your guard - vigilant; "on guard against con artists"; "must remain on your guard in such a situation"
    Antonym: unwary (indirect, via wary)

Definitions from the Web

on guard

Part of Speech: Phrase

Sense 1: Feeling or being ready for action or prepared to face danger or threat.

Example sentence: As the detective entered the crime scene, he remained on guard, alert to any suspicious movements.

Sense 2: A phrase used in fencing to indicate being in a defensive position to defend oneself from an opponent's attack.

Example sentence: The fencer stood on guard, with his foil poised to parry his opponent's thrust.

Sense 3: A phrase used to mean being vigilant or watchful.

Example sentence: On guard against potential theft, the shop owner installed security cameras throughout the store.

Sense 4: A cautionary phrase used to advise someone to be careful or avoid risks.

Example sentence: On guard while driving in heavy rain, the truck driver reduced his speed to ensure safe passage.

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