WordNet (r) 3.0 (2006):

dredge up
    v 1: mention something unpleasant from the past; "Drag up old
         stories" [syn: drag up, dredge up]

Moby Thesaurus II by Grady Ward, 1.0:

96 Moby Thesaurus words for "dredge up":
   accumulate, agglomerate, aggregate, aggroup, amass, assemble,
   avulse, batch, bring together, bulk, bunch, bunch together,
   bunch up, clump, cluster, collect, colligate, collocate, combine,
   compare, compile, conglomerate, corral, cumulate, cut out,
   deracinate, dig out, dig up, disentangle, drag up, draw, draw out,
   draw together, draw up, dredge, drive together, eradicate, evolve,
   evulse, excavate, excise, exsect, extract, extricate, fish up,
   gather, gather in, gather together, gather up, get in, get out,
   get together, gouge out, group, grub up, haul up, join, juxtapose,
   lump together, make up, mass, match, mine, mobilize, muster, pair,
   partner, pick out, pick up, pluck out, pluck up, pull, pull out,
   pull up, put together, quarry, raise, rake out, rake up, rally,
   remove, rip out, root out, root up, round up, scrape together,
   take out, take up, tear out, unearth, unravel, uproot, weed out,
   whip in, withdraw, wrest out