Historical clue formulations

• On guard — 2026-04-23
• [Mayday! Mayday!] — 2026-03-01
• On guard — 2026-02-18
• Message often accompanied by an exclamation point in a triangle — 2025-10-20
• Warn — 2025-08-13
• Certain phone pop-up — 2025-04-25
• Having ears pricked — 2025-04-05
• Breaking news notification — 2024-10-21
• Bright-eyed — 2024-09-25
• "Danger! Danger!" — 2024-07-28
• Wide-awake — 2024-03-13
• Cellphone notification — 2023-06-26
• Notification — 2023-03-12
• On the ball — 2023-02-20
• Attentive — 2023-01-01
• With it — 2022-11-27
• All ears — 2022-10-13
• Smartphone notification — 2022-10-12
• Phone notification — 2022-07-25
• Give a heads-up — 2022-07-03
• A red one is concerning — 2022-03-04
• Opposite of drowsy — 2021-08-23
• Email ___ — 2021-05-29
• Well-caffeinated, perhaps — 2021-05-12
• Smartphone pop-up — 2021-05-07
• "___ the media!" — 2021-03-30
• Emergency notification — 2021-02-24
• Vigilant — 2021-01-04
• On the qui vive — 2020-11-10
• Not sleepy — 2020-07-31
• Wide-eyed — 2020-07-14
• Argus-eyed — 2020-05-07
• Paying attention — 2020-02-25
• Warning — 2020-02-03
• Bulletin — 2019-10-25
• One may be red — 2018-12-05
• Tip off — 2018-10-31
• "Fore!," for one — 2018-10-05
• Reason to check one's phone — 2018-04-14
• Text ___ — 2018-03-24
• On the lookout — 2018-01-25
• Having ears cocked — 2017-12-15
• "Incoming!," e.g. — 2017-12-09
• Ding or buzz, maybe — 2016-09-29
• Incoming text ding, e.g. — 2016-08-02
• Bright-eyed — 2016-04-08
• It can be red or amber — 2016-01-05
• Pop-up, sometimes — 2015-11-01
• See 42-Down — 2015-10-24
• Not nodding — 2015-08-30