ALERT
- ready for sudden action [adj ALERTER, ALERTEST] : ALERTLY [adv] / to warn (to make aware of impending or possible danger) [v ALERTED, ALERTING, ALERTS]
- to warn (to notify in advance) [v -ED, -ING, -S] / ready for action [adj ALERTER, ALERTEST]
- on guard against danger; in readiness; vigilant
- observant
- vigilant
- warning or alarm
- to warn