Answer: ALERT
ALERT is a crossword puzzle answer that we have spotted 258 times.
    - With ears pricked
 
    - On the qui vive
 
    - Tip off
 
    - Red ___
 
    - Tornado siren, e.g.
 
    - Wide-eyed
 
    - Ready
 
    - Heads up
 
    - Heads-up
 
    - Argus-eyed
 
    - Open-eyed
 
    - Red flag
 
    - Like a good guard
 
    - Ready for anything
 
    - Notify of danger
 
    - On the ball
 
    - "Heads up!," e.g.
 
    - Yellow ___
 
    - With it
 
    - On one's toes
 
    - Ready to react, perhaps
 
    - Like Argus
 
    - Whistle, for one
 
    - Siren
 
    - *Siren ... danger ... perked up
 
    - Warn
 
    - Wide-awake
 
    - Ready to jump, perhaps
 
    - It may be red
 
    - Red __ (danger signal)
 
    - Whistle, maybe
 
    - Notify
 
    - "Look out below!," e.g.
 
    - Red flag, e.g.
 
    - Listening
 
    - Sharp
 
    - Watchful
 
    - Red light
 
    - At the ready
 
    - Yellow flag
 
    - Vigilant
 
    - Storm __ (weather warning)
 
    - Not nodding
 
    - Bushy-tailed?
 
    - Word often preceded by a color
 
    - Danger signal
 
    - Red state?
 
    - On guard
 
    - Having heightened senses
 
    - With it, in a sense
 
    - Fully conscious
 
    - Put on call
 
    - All-points bulletin
 
    - Siren, e.g.
 
    - Warning signal
 
    - Wide awake
 
    - Give a heads-up to
 
    - All ears
 
    - Use a whistle, maybe
 
    - Primed for action
 
    - On the lookout
 
    - Send a heads-up to
 
    - Warning
 
    - Like good guards
 
    - Not out of it
 
    - Make aware
 
    - Red-flag
 
    - Forewarn
 
    - Attentive
 
    - All eyes and ears
 
    - Observant
 
    - Notice
 
    - Caffeinated?
 
    - Not caught napping
 
    - Like a sentry
 
    - Flag
 
    - Readiness condition
 
    - APB, for one
 
    - Storm warning
 
    - Put on notice
 
    - Fully attentive
 
    - Fully awake
 
    - Percipient
 
    - Standing by
 
    - Paying attention
 
    - Give notice
 
    - Bring to the attention of
 
    - With eyes wide open
 
    - Like a watchdog
 
    - ''Heads up!'' e.g.
 
    - Qui vive
 
    - Far from drowsy
 
    - Awake and aware
 
    - On your toes
 
    - Storm posting, e.g.
 
    - Mentally responsive
 
    - Type of post-caffeine state
 
    - All-points bulletin, e.g.
 
    - In a post-caffeine state
 
    - Blow the horn at
 
    - Not asleep on the job
 
    - Quick on the uptake
 
    - Conscious
 
    - Emulate Paul Revere
 
    - Standing at the ready
 
    - Eagle-eyed
 
    - Advance warning
 
    - Bulletin
 
    - Shout "heads up!"
 
    - Sound the alarm
 
    - Paying heed
 
    - Not dozing
 
    - "Heads up!" e.g.
 
    - Like a good guard dog
 
    - It's high when it's red
 
    - Bright-eyed and bushy-tailed
 
    - Attentive to possible danger
 
    - Clear-witted
 
    - Highly vigilant
 
    - Bit of Weather Channel news
 
    - Sign word that may be followed by an exclamation point
 
    - Quick-witted
 
    - Bright eyed and bushy tailed
 
    - Watchful and ready
 
    - Bright-eyed
 
    - Caution
 
    - Ready for whatever
 
    - Like good watchmen
 
    - Like sentries
 
    - Not drowsy
 
    - Not  dozing
 
    - Not  nodding
 
    - Far from sleepy
 
    - Like watchmen
 
    - Flag down, say
 
    - Give a heads-up
 
    - More than just awake
 
    - Keeping one's radar up
 
    - Having pricked ears
 
    - Ready for trouble
 
    - Early warning
 
    - Taking it all in
 
    - Colorful warning, often
 
    - Ready for action
 
    - Danger signal, e.g.
 
    - Quick witted
 
    - Police bulletin
 
    - Warning of danger
 
    - Vigilantly attentive
 
    - Like prairie dogs, notably
 
    - Offer a heads-up
 
    - In state of readiness
 
    - Like a good lookout
 
    - Quick
 
    - Wake-up call, say
 
    - Not easy to fool
 
    - Fit for guard duty
 
    - Like a good watchdog
 
    - Sound of an incoming text, e.g.
 
    - Danger notice
 
    - Warning that's often red
 
    - Keenly attentive
 
    - Give notice to
 
    - Not foggy-headed
 
    - Military state?
 
    - News ___
 
    - With one's eyes wide open
 
    - Flood warning, perhaps
 
    - Red flag, maybe
 
    - Sound a warning
 
    - A serious one might be red
 
    - Clearheaded
 
    - Fully caffeinated, say
 
    - Wakeful
 
    - See 42-Down
 
    - With an agile attitude
 
    - Pop-up, sometimes
 
    - Not asleep at the wheel
 
    - It can be red or amber
 
    - Trouble indicator
 
    - Word with red or on
 
    - Ready for sentry duty
 
    - Wary
 
    - Like the best guard dogs
 
    - Incoming text ding, e.g.
 
    - Definitely on one's toes
 
    - Not likely to miss much
 
    - Well rested
 
    - Ding or buzz, maybe
 
    - Paying close attention
 
    - Like the best security guards
 
    - Cautious and conscious
 
    - Cautious
 
    - Focused
 
    - Paying careful attention
 
    - Frost advisory, e.g.
 
    - With ears pricked up
 
    - Cellphone notice
 
    - Shout "Duck!" to, say
 
    - Ready for an attack, say
 
    - Yell "Heads up!" to
 
    - See 134-Across
 
    - Not missing a trick
 
    - Antarctic base
 
    - "Incoming!," e.g.
 
    - Having ears cocked
 
    - Weather advisory
 
    - Send a warning to
 
    - Text ___
 
    - Ready to act
 
    - Reason to check one's phone
 
    - Advisory
 
    - Message from Security
 
    - Aware
 
    - Request of a retail website
 
    - Cellphone notification
 
    - Keen-eyed
 
    - On one's guard
 
    - "Fore!," for one
 
    - One may be red
 
    - Caffeinated, perhaps
 
    - Warn of 62 Across
 
    - Keeping an eye peeled
 
    - Having perked-up ears
 
    - On top of things
 
    - You might issue one for spoilers
 
    - Smartphone notification
 
    - Warning word often preceded by a color
 
    - Message from an app
 
    - Not sleepy
 
    - Important notification
 
    - "Spoiler ___!"
 
    - Ding on a phone, maybe
 
    - Emergency notification
 
    - "___ the media!"
 
    - Smartphone pop-up
 
    - Well-caffeinated, perhaps
 
    - Notification
 
    - Email ___
 
    - "The Circle" notification
 
    - Opposite of drowsy
 
    - Word after "spoiler" or "news"
 
    - A red one is concerning
 
    - Air raid signal, e.g.
 
    - Phone notification
 
    - Notification, e.g.
 
    - Hyperaware
 
    - 30-Across, for one
 
    - Urgent notification
 
    - App notification
 
    - Phone reminder, e.g.
 
    - Phone setting
 
    - Like a guard on duty
 
    - Breaking news notification
 
    - Having ears pricked
 
    - On edge
 
    - Certain phone pop-up
 
    - Message often accompanied by an exclamation point in a triangle