cloak
A long outer garment worn over the shoulders covering the back; a cape, often with a hood.
But how is the boy getting here, Dumbledore?” She eyed his cloak suddenly as though she thought he might be hiding Harry underneath it.
A blanket-like covering, often metaphorical.
But as we were allowed of God to be put in trust with the gospel, even so we speak; not as pleasing men, but God, which trieth our hearts. For neither at any time used we flattering words, as ye know, nor a cloke of covetousness; God is witness:
(figurative) That which conceals; a disguise or pretext.
(Internet) A text replacement for an IRC user's hostname or IP address, making the user less identifiable.
To cover as with or like a cloak.
(figurative) To cover up, hide or conceal.
(science fiction) To render or become invisible via futuristic technology.