WordNet (r) 3.0 (2006):

take a powder
    v 1: disappear without notifying anyone (idiom) [syn: skip
         town, take a powder]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "take a powder":
   absquatulate, beat it, blow, decamp, dog it, duck and run,
   duck out, lam, make off, powder, scram, skedaddle, skin out, skip,
   skip out, split, take off, vamoose