1. Vigilant
   "must remain on your guard in such a situation"
   - on guard, on one's guard, upon one's guard

See also: wary

• dree
• dreg
• dregs
• dreidel
• dreidl
• Dreiser
• Dreissena
• Dreissena polymorpha
• drench
• drenched
• drenched in
• drenching
• Drepanididae
• Drepanis
• drepanocytic anaemia
• drepanocytic anemia
• Dresden
• dress
• dress blues
• dress circle
• dress code
• dress down
• dress hanger
• dress hat
• dress out