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A colloportus is A charm which locks doors magically so that the door cannot be opened manually.


Colloportus History
The Locking Charm, taught to students at Hogwarts School of Witchcraft and Wizardry during their first-year Charms class from The Standard Book of Spells, Grade 1. The counter-charm for this spell is the Unlocking Charm (Alohomora).

Colloportus Etymology 
From the Latin prefix “collo-” meaning “to bind together” and the Latin “portus” meaning “door.”