simple past tense and past participle of stack up

plural of flare stack

a tall structure used for burning off waste gas at oil refineries and other installations.

plural of sea stack

(chiefly Britain, geology) A pillar of rock that rises from the ocean, formed by surrounding softer ground eroding away.

(Australia, games) A children's dogpile game. / (Australia) Synonym of dogpile, especially in Australian football.

(figuratively, intransitive) To give an unfair advantage to somebody.

(slang, railfans, US) The sound made by the exhaust of a steam locomotive.

plural of stack effect

The phenomenon of air buoyancy leading to the movement of air into and out of buildings, chimneys, etc., which may drive natural ventilation, air infiltration, and fires.