From The Collaborative International Dictionary of English v.0.48:
Cloak \Cloak\ (kl[=o]k; 110), n. [Of. cloque cloak (from the bell-like shape), bell, F. cloche bell; perh. of Celtic origin and the same word as E. clock. See 1st Clock.] 1. A loose outer garment, extending from the neck downwards, and commonly without sleeves. It is longer than a cape, and is worn both by men and by women. [1913 Webster]
2. That which conceals; a disguise or pretext; an excuse; a fair pretense; a mask; a cover. [1913 Webster]
No man is esteemed any ways considerable for policy who wears religion otherwise than as a cloak. --South. [1913 Webster]
Cloak bag, a bag in which a cloak or other clothes are carried; a portmanteau. --Shak. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Cloak \Cloak\, v. t. [imp. & p. p. Cloaked; p. pr. & vb. n. Cloaking.] To cover with, or as with, a cloak; hence, to hide or conceal. [1913 Webster]
Now glooming sadly, so to cloak her matter. --Spenser.
Syn: See Palliate. [1913 Webster]