WordNet (r) 3.0 (2006):

tuck in
    v 1: eat up; usually refers to a considerable quantity of food;
         "My son tucked in a whole pizza" [syn: tuck in, tuck
         away, put away]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "tuck in":
   bed, consume, cradle, devour, dispatch, dispose of, down, ease in,
   eat up, get away with, get down, infuse, ingest, inject, inoculate,
   insert, insinuate, interject, introduce, intromit, nestle, perfuse,
   pop in, put away, put in, put to bed, set in, slip in, snug,
   snug down, snug up, snuggle, stick in, surround, swallow,
   take down, take in, throw in, whip in