Expulso – Harry Potter Lexicon

"Expulso? Expulso and we’ll be clearing bits of Time-Turner from this owlery for days."
-- Scorpius Malfoy (CC3.16)

Blows up the target.

References from the canon

Used by Thorfinn Rowle during the fight at the café; he blew up the table behind Harry with it (DH9).
Scorpius Malfoy and Albus Potter discuss whether to use this to destroy the Experimental Time-Turner (CC3.16).
Delphi explodes the floor behind Harry Potter during their duel, although she was probably hoping to hit him directly with it (CC4.11).