The Collaborative International Dictionary of English v.0.48:

Smock \Smock\ (sm[o^]k), n. [AS. smocc; akin to OHG. smocho,
   Icel. smokkr, and from the root of AS. sm[=u]gan to creep,
   akin to G. schmiegen to cling to, press close, MHG. smiegen,
   Icel. smj[=u]ga to creep through, to put on a garment which
   has a hole to put the head through; cf. Lith. smukti to
   glide. Cf. Smug, Smuggle.]
   1. A woman's under-garment; a shift; a chemise.
      [1913 Webster]

            In her smock, with head and foot all bare.
                                                  --Chaucer.
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   2. A blouse; a smoock frock. --Carlyle.
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The Collaborative International Dictionary of English v.0.48:

Smock \Smock\, a.
   Of or pertaining to a smock; resembling a smock; hence, of or
   pertaining to a woman.
   [1913 Webster]

   Smock mill, a windmill of which only the cap turns round to
      meet the wind, in distinction from a post mill, whose
      whole building turns on a post.

   Smock race, a race run by women for the prize of a smock.
      [Prov. Eng.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Smock \Smock\, v. t.
   To provide with, or clothe in, a smock or a smock frock.
   --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

smock
    n 1: a loose coverall (coat or frock) reaching down to the
         ankles [syn: duster, gaberdine, gabardine, smock,
         dust coat]
    v 1: embellish by sewing in straight lines crossing each other
         diagonally; "The folk dancers wore smocked shirts"