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3. on guard

on guard

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*on (one's) guard (against someone or something)

alert against someone or something. (*Typically: be ~; keep ~; remain ~; stay ~.) Try to stay on guard against pickpockets. I am always on my guard. Be on guard when you go into the city.

See also: guard, on

on your guard

to be careful and aware because a situation might be dangerous I resent this attitude that you can't trust anybody, that you always have to be on your guard.

See also: guard, on

on (one's) guard

Alert and watchful; cautious.

See also: guard, on