upon one's guard

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Definitions from WordNet

Adjective upon one's guard has 1 sense

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

Upon One's Guard

Description:

The phrase "upon one's guard" means to be cautious, alert, and watchful, especially in anticipation of potential danger or threats.

Example Sentences:

1. After getting robbed once, Emily always stays upon her guard when walking alone at night.

2. The soldiers were instructed to be upon their guard at all times during the mission.

3. Being upon your guard is essential when dealing with unknown callers asking for personal information.

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