cloak

A long outer garment worn over the shoulders covering the back; a cape, often with a hood.

A blanket-like covering, often metaphorical.

“Night hid her movements with its cloak of darkness.”

That which conceals; a disguise or pretext.

A text replacement for an IRC user's hostname or IP address, making the user less identifiable.

To cover as with a cloak.

To hide or conceal.

To render or become invisible via futuristic technology.

“The ship cloaked before entering the enemy sector of space.”