| alert | | |
| n. (state) | 1. alert, qui vive | condition of heightened watchfulness or preparation for action.; "bombers were put on alert during the crisis" |
| ~ preparedness, readiness, preparation | the state of having been made ready or prepared for use or action (especially military action).; "putting them in readiness"; "their preparation was more than adequate" |
| ~ air alert | the condition in which combat aircraft are airborne and ready for an operation.; "aircraft in the Mideast are on air alert" |
| ~ red alert | the highest level of alert when an attack by the enemy seems imminent (or more generally a state of alert resulting from imminent danger). |
| ~ strip alert | a state of readiness for domestic defense aircraft.; "the Air Force will keep fighters on strip alert at bases around the country" |
| n. (communication) | 2. alert, alerting | a warning serves to make you more alert to danger. |
| ~ warning | a message informing of danger.; "a warning that still more bombs could explode" |
| ~ eas, emergency alert system | a federal warning system that is activated by FEMA; enables the President to take over the United States airwaves to warn the whole country of major catastrophic events. |
| n. (communication) | 3. alarm, alarum, alert, warning signal | an automatic signal (usually a sound) warning of danger. |
| ~ torpedo | a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead. |
| ~ signal, signaling, sign | any nonverbal action or gesture that encodes a message.; "signals from the boat suddenly stopped" |
| ~ air alert | the warning signal that begins a period of preparation for an enemy air attack. |
| ~ burglar alarm | a loud warning signal produced by a burglar alarm.; "they could hear the burglar alarm a mile away" |
| ~ fire alarm | a shout or bell to warn that fire has broken out. |
| ~ foghorn, fogsignal | a loud low warning signal that can be heard by fogbound ships. |
| ~ horn | a noise made by the driver of an automobile to give warning. |
| ~ red flag | a flag that serves as a warning signal.; "we didn't swim at the beach because the red flag was up" |
| ~ siren | a warning signal that is a loud wailing sound. |
| ~ alarm bell, tocsin | the sound of an alarm (usually a bell). |
| v. (communication) | 4. alarm, alert | warn or arouse to a sense of danger or call to a state of preparedness.; "The empty house alarmed him"; "We alerted the new neighbors to the high rate of burglaries" |
| ~ warn | notify of danger, potential harm, or risk.; "The director warned him that he might be fired"; "The doctor warned me about the dangers of smoking" |
| ~ wake | make aware of.; "His words woke us to terrible facts of the situation" |
| adj. | 5. alert, watchful | 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" |
| ~ open-eyed, vigilant, wakeful, argus-eyed | carefully observant or attentive; on the lookout for possible danger.; "a policy of open-eyed awareness"; "the vigilant eye of the town watch"; "there was a watchful dignity in the room"; "a watchful parent with a toddler in tow" |
| ~ fly | (British informal) not to be deceived or hoodwinked. |
| ~ heads-up, wide-awake | fully alert and watchful.; "played heads-up ball" |
| ~ sleepless, lidless | always watchful.; "to an eye like mine, a lidless watcher of the public weal" |
| ~ wary | marked by keen caution and watchful prudence.; "they were wary in their movements"; "a wary glance at the black clouds"; "taught to be wary of strangers" |
| ~ awake | not in a state of sleep; completely conscious.; "lay awake thinking about his new job"; "still not fully awake" |
| ~ lively | full of life and energy.; "a lively discussion"; "lively and attractive parents"; "a lively party" |
| adj. | 6. alert, brisk, lively, merry, rattling, snappy, spanking, zippy | 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" |
| ~ energetic | possessing or exerting or displaying energy.; "an energetic fund raiser for the college"; "an energetic group of hikers"; "it caused an energetic chemical reaction" |
| adj. | 7. alert, alive, awake | 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" |
| ~ aware, cognisant, cognizant | (sometimes followed by `of') having or showing knowledge or understanding or realization or perception.; "was aware of his opponent's hostility"; "became aware of her surroundings"; "aware that he had exceeded the speed limit" |
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