The Collaborative International Dictionary of English v.0.48:

Tuck \Tuck\, v. t. [imp. & p. p. Tucked; p. pr. & vb. n.
   Tucking.] [OE. tukken, LG. tukken to pull up, tuck up,
   entice; akin to OD. tocken to entice, G. zucken to draw with
   a short and quick motion, and E. tug. See Tug.]
   1. To draw up; to shorten; to fold under; to press into a
      narrower compass; as, to tuck the bedclothes in; to tuck
      up one's sleeves.
      [1913 Webster]

   2. To make a tuck or tucks in; as, to tuck a dress.
      [1913 Webster]

   3. To inclose; to put within; to press into a close place;
      as, to tuck a child into a bed; to tuck a book under one's
      arm, or into a pocket.
      [1913 Webster]

   4. [Perhaps originally, to strike, beat: cf. F. toquer to
      touch. Cf. Tocsin.] To full, as cloth. [Prov. Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

tucked
    adj 1: having tucked or being tucked; "tightly tucked blankets";
           "a fancy tucked shirt" [ant: untucked]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "tucked":
   creased, crimped, dog-eared, doubled, flexible, flounced, fluted,
   foldable, folded, folding, gathered, plaited, pleated, pliable,
   plicate, plicated, plicatile, quilled, ruffled, twilled