The Collaborative International Dictionary of English v.0.48:

Twig \Twig\, v. t.
   To beat with twigs.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Twig \Twig\ (tw[i^]g), v. t. [imp. & p. p. Twigged (tw[i^]gd);
   p. pr. & vb. n. Twigging.] [Cf. Tweak.]
   To twitch; to pull; to tweak. [Obs. or Scot.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Twig \Twig\, v. t. [Gael. tuig, or Ir. tuigim I understand.]
   [1913 Webster]
   1. To understand the meaning of; to comprehend; as, do you
      twig me? [Colloq.] --Marryat.
      [1913 Webster]

   2. To observe slyly; also, to perceive; to discover. "Now
      twig him; now mind him." --Foote.
      [1913 Webster]

            As if he were looking right into your eyes and
            twigged something there which you had half a mind to
            conceal.                              --Hawthorne.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Twig \Twig\, n. [AS. twig; akin to D. twijg, OHG. zw[imac]g,
   zw[imac], G. zweig, and probably to E. two.]
   A small shoot or branch of a tree or other plant, of no
   definite length or size.
   [1913 Webster]

         The Britons had boats made of willow twigs, covered on
         the outside with hides.                  --Sir W.
                                                  Raleigh.
   [1913 Webster]

   Twig borer (Zool.), any one of several species of small
      beetles which bore into twigs of shrubs and trees, as the
      apple-tree twig borer (Amphicerus bicaudatus).

   Twig girdler. (Zool.) See Girdler, 3.

   Twig rush (Bot.), any rushlike plant of the genus Cladium
      having hard, and sometimes prickly-edged, leaves or
      stalks. See Saw grass, under Saw.
      [1913 Webster]

WordNet (r) 3.0 (2006):

twig
    n 1: a small branch or division of a branch (especially a
         terminal division); usually applied to branches of the
         current or preceding year [syn: branchlet, twig,
         sprig]
    v 1: branch out in a twiglike manner; "The lightning bolt
         twigged in several directions"
    2: understand, usually after some initial difficulty; "She
       didn't know what her classmates were plotting but finally
       caught on" [syn: catch on, get wise, get onto,
       tumble, latch on, cotton on, twig, get it]

The Free On-line Dictionary of Computing (19 January 2023):

TWIG

   Tree-Walking Instruction Generator.

   A code generator language.  ML-Twig is an SML/NJ
   variant.

   ["Twig Language Manual", S.W.K. Tijang, CS TR 120, Bell Labs,
   1986].

   (1995-01-31)