Actions

Expelliarmus

From Hayashi Park Potterverse for 5th ed. Dungeons and Dragons (5e)

Expelliarmus 

(Disarming Charm)

1st-level abjuration

Casting time
 1 action
Range
 60 feet
Components
 V,S
Duration
 instantaneous
Process 
This spell is an attempt to knock something out of someone’s grasp. When cast, the target makes a Strength(Athletics) check or Dexterity( Acrobatics) Check against your spell DC . On a failure, the object will fly from the target’s grasp up to 10 feet in a random direction determined by the Dungeon Master.[1]
At higher levels 
For every level higher than 2nd, the spell causes 1d4 of force damage.[2]

Harry Potter Spell Description

This charm will cause an item that a victim is holding to fly away. If used with more force it can knock out the victim.[3]

Etymology: Probably a combination of Latin expello, meaning “expel”, and arma, meaning “weapon”.[4]