condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis" (同)qui_vive
engaged in or accustomed to close observation; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty" (同)watchful
a warning serves to make you more alert to danger (同)alerting
mentally perceptive and responsive;"an alert mind"; "alert to the problems"; "alive to what is going on"; "awake to the dangers of her situation"; "was now awake to the reality of his predicament" (同)alive, awake
quick and energetic; "a brisk walk in the park"; "a lively gait"; "a merry chase"; "traveling at a rattling rate"; "a snappy pace"; "a spanking breeze" (同)brisk, lively, merry, rattling, snappy, spanking, zippy
to keep watch over; "there would be men guarding the horses"
a device designed to prevent injury or accidents (同)safety, safety device
(American football) a position on the line of scrimmage; "guards must be good blockers"
a position on a basketball team
a posture of defence in boxing or fencing; "keep your guard up"
a military unit serving to protect some place or person
a person who keeps watch over something or someone
the person who plays that position on a football team; "the left guard was injured on the play"
the person who plays the position of guard on a basketball team
watch over or shield from danger or harm; protect; "guard my possessions while Im away" (同)ward
take precautions in order to avoid some unwanted consequence; "guard against becoming too friendly with the staff"; "guard against infection"