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]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "twig":
   accept, appendage, arm, bine, bough, branch, branchedness,
   branchiness, burgeon, catch, catch on, comprehend, craze, cry,
   deadwood, descry, dig, discern, distinguish, divine, espy, fad,
   fathom, flagellum, fork, frond, furore, get, grasp, hand, imp,
   joint, know, leg, limb, link, lobe, lobule, mark, member, mode,
   note, notice, observe, offshoot, organ, perceive, pinion, rage,
   ramage, ramification, rumble, runner, sapling, sarment, scion, see,
   seedling, sense, set, shoot, slip, spear, spray, sprig, sprit,
   sprout, spur, stem, stick, stolon, style, sucker, switch, tail,
   take, take in, tendril, thallus, tumble to, understand, vogue,
   wing



The Free On-line Dictionary of Computing (30 December 2018):

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)