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Adjective: on guard
  1. Vigilant
    "on guard against con artists";
    - on one's guard, upon one's guard, on your guard

See also: wary

Nearest

on call
on camera
on cloud nine
on demand
on earth
on edge
on end
on faith
on fire
on fleek
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