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Adjective: on one's guard
  1. Vigilant
    - on guard, upon one's guard, on your guard

See also: wary

Nearest

on faith
on fire
on guard
on hand
on hold
on ice
on it
on message
on occasion
on one hand
on one's guard
on paper
on purpose
on request
on tap
on tenterhooks
on that
on that point
on the average
on the ball
on the button