| Red |
| Flag |
| Keen |
| Warn |
| Wary |
| On to |
| Brisk |
| Awake |
| Siren |
| Aware |
| Alarm |
| Nimble |
| Notice |
| Lively |
| Awaken |
| Quick! |
| Notify |
| Tocsin |
| Yellow |
| Tip off |
| Warning |
| Focused |
| With it |
| On edge |
| Wakeful |
| Careful |
| Caution |
| Bulletin |
| All ears |
| Watchful |
| Heads up |
| Vigilant |
| Red flag |
| Advisory |
| News ___ |
| Text ___ |
| Forewarn |
| Watching |
| Qui vive |
| On guard |
| Wide-eyed |
| Observant |
| Open-eyed |
| Conscious |
| Attentive |
| ___ ready |
| Prepared. |
| Sharp ___ |
| Keen-eyed |
| Make wary |
| Red light |
| Listening |
| On the job |
| Not dozing |
| Red state? |
| Eagle-eyed |
| Perceptive |
| Make aware |
| Like Argus |
| Not drowsy |
| Percipient |
| Red chaser |
| Sitting up |
| Argus-eyed |
| Siren, e.g. |
| On the ball |
| Not nodding |
| Give notice |
| Bright-eyed |
| Clearheaded |
| Wide awake. |
| Paying heed |
| Fully awake |
| Yellow flag |
| Standing by |
| Quick-witted |
| Put on guard |
| Spoiler ___! |
| APB, for one |
| Caffeinated? |
| Firm warning |
| On the ready |
| Raid warning |
| Ready to act |
| Red follower |
| On your toes |
| At the ready |
| Not out of it |
| On one's toes |
| Storm warning |
| Danger signal |
| Early warning |
| Full of NoDoz |
| Siren warning |
| Totally awake |
| Bushy-tailed? |
| Show heads-up |
| Tour heads-up |
| Danger notice |
| It may be red |
| Like a sentry |
| Put on notice |
| Warning signal |
| Antarctic base |
| Flag down, say |
| One may be red |
| Red flag, e.g. |
| Whistle, maybe |
| Warning notice |
| Give notice to |
| On the lookout |
| On one's guard |
| On the qui vive |
| Fully conscious |
| Sound the alarm |
| Sharp as a tack |
| Fore!," for one |
| Air-raid signal |
| Cell phone beep |
| Like a watchdog |
| Ready for shows |
| Military state? |
| Red flag, maybe |
| Sound a warning |
| Advance warning |
| Awake and aware |
| Give a heads-up |
| Far from drowsy |
| Fully attentive |
| Highly vigilant |
| On top of things |
| Paying attention |
| Ready for action |
| Incoming!," e.g. |
| Cellphone notice |
| Inform, in a way |
| Like a guard dog |
| Like good guards |
| Not easy to fool |
| Offer a heads-up |
| Put on the ready |
| Taking it all in |
| Weather advisory |
| Whistle, for one |
| Blow the horn at |
| Not foggy-headed |
| Keenly attentive |
| Shout "heads up! |
| Sound the tocsin |
| Notify of danger |
| Signal of a sort |
| Warning of danger |
| Not easily fooled |
| Prepared to react |
| Pop-up, sometimes |
| Wake-up call, say |
| Like a good guard |
| Send a warning to |
| This might be red |
| Primed for action |
| Ready for trouble |
| Trouble indicator |
| With ears pricked |
| All eyes and ears |
| ''Heads up!'' e.g. |
| Having ears cocked |
| Issue a warning to |
| Not caught napping |
| Ready for whatever |
| Send a heads-up to |
| Fit for guard duty |
| Like good sentries |
| Like good watchmen |
| Watchful and ready |
| Give a heads-up to |
| Ready for anything |
| With it, in a sense |
| With eyes wide open |
| Quick on the uptake |
| All points bulletin |
| Constantly vigilant |
| Ding or buzz, maybe |
| Readiness condition |
| Storm posting, e.g. |
| Word with red or on |
| Danger signal, e.g. |
| Having pricked ears |
| Fit for sentry duty |
| Like a good lookout |
| Not missing a trick |
| Yell "Heads up!" to |
| Quiet Riot "Red ___ |
| Mentally responsive |
| Prepared for action |
| Tornado siren, e.g. |
| Emulate Paul Revere |
| Caffeinated, perhaps |
| Frost advisory, e.g. |
| Keeping a good watch |
| More than just awake |
| Use a whistle, maybe |
| With ears pricked up |
| Like a good watchdog |
| Vigilantly attentive |
| Message from Security |
| Ready for sentry duty |
| Shout "Duck!" to, say |
| Not asleep on the job |
| On the ___ (vigilant) |
| Paying full attention |
| Standing at the ready |
| Like a good guard dog |
| Look out below!," e.g. |
| Cautious and conscious |
| Cellphone notification |
| Ding on a phone, maybe |
| Error message, for one |
| Fully caffeinated, say |
| It can be red or amber |
| Keeping one's radar up |
| Like a worthy watchdog |
| Ready to jump, perhaps |
| With an agile attitude |
| ___ Bay, Canadian port |
| Paying close attention |
| Colorful warning, often |
| It's high when it's red |
| Like a good base-runner |
| Not asleep at the wheel |
| Not likely to miss much |
| Ready to react, perhaps |
| Smartphone notification |
| A serious one may be red |
| Definitely on one's toes |
| Incoming text ding, e.g. |
| Like the best guard dogs |
| Make buddy aware of show |
| Ready for an attack, say |
| Warning that's often red |
| In a post-caffeine state |
| Paying careful attention |
| Having heightened senses |
| Bring to the attention of |
| One may precede a spoiler |
| Well-caffeinated, perhaps |
| Red ___ (serious warning) |
| With one's eyes wide open |
| All-points bulletin, e.g. |
| A serious one might be red |
| Like prairie dogs, notably |
| Bit of Weather Channel news |
| Facebook notification, e.g. |
| Important text notification |
| Like an excellent guard dog |
| Reason to check one's phone |
| Request of a retail website |
| Type of post-caffeine state |
| Bright-eyed and bushy-tailed |
| Bring to someone's attention |
| In a high state of readiness |
| Red ___ (state of emergency) |
| Attentive to possible danger |
| Like the best security guards |
| Siren ... danger ... perked up |
| Word often preceded by a color |
| Sound of an incoming text, e.g. |
| National Weather Service message |
| Notification sent to one's phone |
| Red ___!" (cry on the Enterprise) |
| On the ___ (watching for trouble) |
| You may receive it on a smartphone |
| What fans are on, for upcoming shows |
| Spoiler ___ (warning in TV episode recaps) |
| Might come as a text about a secret show location |
| Sign word that may be followed by an exclamation point |
| Google ___ (notification I get every time Justin Bieber does anything) |
| I have one for "gerbils" set up on Google so I can keep up on all the latest gerbil news |
| Spoiler ___ (disclaimer before telling someone that Walt kills Jesse then himself in the last episode of "Breaking Bad," say) |