alarming

Verb

alarm (third-person singular simple present alarms, present participle alarming, simple past and past participle alarmed)

1. (transitive) To call to arms for defense.
2. (transitive) To give (someone) notice of approaching danger or necessary action; to rouse to vigilance; to put on the alert.
   • The sudden drop in temperature should alarm you into taking precautions.
3. (transitive) To produce a warning of approaching danger or necessary action; to emit a signal intended to rouse a recipient to vigilance or put them on the alert.
   • The tower cab supervisor and various pilots stated that the LLWAS system frequently alarms because of the thunderstorm activity present, and that airspeed losses are common as a result of convective wind shear.1985 March 21, National Transportation Safety Board, “2.2 Environmental Factors”, in Aircraft Accident Report: United Airlines Flight 663, Boeing 727-222, N7647U, Denver, Colorado, May 31, 1984, page...
4. (transitive) To surprise with apprehension of danger; to fill with anxiety in regard to threatening evil; to excite with sudden fear.
   • The loud bang in the hallway seemed to alarm everyone in the building.
5. (transitive) To keep in excitement; to disturb.

See all 12 meanings of alarm