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Adjective:
on guard
Vigilant
"on
guard
against
con
artists
";
-
on one's guard
,
upon one's guard
,
on your guard
See also:
wary
on camera
on cloud nine
on demand
on duty
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 coattails
on one's guard
on paper