The following information contain spoilers.
The object-expelling hex (incantation: Expello) expells any object it is pointed towards and is sometimes used to disarm opponents of their weapon in duels. If cast specifically on a wand the incantation must be Expello wand, implying the name of the object must be present at the end of the incantation to work on that specific object. The object-expelling hex in a duel seems to be an alternative to the disarming spell.
|2006 or earlier||Anthony Eevora cast the object-expelling hex on Lord Alex's wand with the incantation Expello wand, causing the dark wizard's wand to fly out of his hand and back behind some of the movie theater seats.|