Meaning

noun a violent weather condition with winds 64-72 knots (11 on the Beaufort scale) and precipitation and thunder and lightning

noun a violent commotion or disturbance

noun a direct and violent assault on a stronghold

originThe verb is derived from Middle English stormen (“of the wind: to blow violently; to cause to roll or toss”), from storm (noun) (see etymology 1) + -en (suffix forming the infinitives of verbs). Compare Middle English sturmen (“to attack (someone) with great force”), from Old English styrman (“to rage, storm; to make a great noise, cry aloud, shout, storm”), from Proto-West Germanic *sturmijan…

Etymology from Wiktionary, CC BY-SA 3.0