A disturbed state of the atmosphere causing destructive or unpleasant weather, typically involving strong winds, lightning, thunder, and precipitation, or a heavy fall of precipitation or bout of lightning and thunder without strong winds, or a weather phenomenon consisting of a system of winds rotating around a center of low atmospheric pressure, or a disturbed state of the atmosphere with a wind speed between 89 and 117 kilometers per hour.

(figurative) A noun "storm" represents a heavy expulsion or fall of things, a violent agitation of human society, a violent commotion or outbreak of sounds, speech, thoughts, etc., and a violent attack of disease, pain, physiological reactions, symptoms, etc.

(Canada, US, chiefly in the plural) Ellipsis of storm window (“a second window (originally detachable) attached on the exterior side of a window in climates with harsh winters, to add an insulating layer of still air between the outside and inside”).

(military) A violent assault on a fortified position or stronghold.

(impersonal, chiefly US) Preceded by the dummy subject it: to have strong winds and usually lightning and thunder, and/or hail, rain, or snow.

(transitive) To agitate or trouble someone violently, use harsh language, and violently assault a fortified position or stronghold with the aim of gaining control, as well as figuratively assault or gain control over someone's heart, mind, etc.

(intransitive) Be violent weather with strong winds, lightning, thunder, and precipitation, to be exposed to harsh weather, and to move quickly and noisily in a state of anger or uproar, assault a fortified position, or use harsh language.