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.
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   2. That which conceals; a disguise or pretext; an excuse; a
      fair pretense; a mask; a cover.
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            No man is esteemed any ways considerable for policy
            who wears religion otherwise than as a cloak.
                                                  --South.
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   Cloak bag, a bag in which a cloak or other clothes are
      carried; a portmanteau. --Shak.
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