WordNet (r) 3.0 (2006):

squirrel away
    v 1: save up as for future use [syn: hoard, stash, cache,
         lay away, hive up, squirrel away]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "squirrel away":
   accumulate, amass, arrange for, backlog, collect, cumulate,
   forearm, garner, garner up, gather into barns, heap up, hide,
   hoard, hoard up, hold, keep, lay by, lay up, look out for,
   make provision for, make sure against, pile up, prepare for,
   provide against, provide for, put up, save, save up, secrete,
   squirrel, stock up, stockpile, store up, treasure, treasure up