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alert
This word carries a high-energy, high-vigilance feeling. It is not just about being awake, but about being poised for immediate action. It suggests a state of readiness where the senses are sharpened to detect a specific trigger or threat. In modern digital contexts, it has shifted from a human state of mind to a technical notification. While an alert person is focused and attentive, an alert on a phone is a disruptive signal designed to break concentration and demand attention.
Countable when referring to a specific notification or alarm (a weather alert). Uncountable when referring to a general state of readiness (the base is on high alert).