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

See also: wary

Nearest

uplifted
uplifting
uplifting trance
upliftment
uplink
upload
uplook
upmarket
upmost
upon
upon one's guard
upper
Upper Avon
Upper Avon River
upper balcony
upper berth
upper bound
upper cannon
Upper Carboniferous
Upper Carboniferous period
upper class