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

See also: wary

Nearest

uplift
uplifted
uplifting
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