On Guard
[adj] vigilant; "on guard against con artists"; "must remain on your guard in such a situation"
Related Information
Related Terms
all ears, all eyes, Argus-eyed, at bay, aux abois, aux aguets, canny, careful, cautious, circumspect, custodial, defensively, deliberate, discreet, eagle-eyed, gingerly, guarded, hawk-eyed, heedful, hesitant, in defense, in self-defense, judicious, keen-e