n condition of heightened watchfulness or preparation for action
bombers were put on alert during the crisis
n a warning serves to make you more alert to danger
n an automatic signal (usually a sound) warning of danger
v warn or arouse to a sense of danger or call to a state of preparedness
We alerted the new neighbors to the high rate of burglaries
a 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
s quick and energetic
s mentally perceptive and responsive
an alert mind alert to the problems