The Collaborative International Dictionary of English v.0.48:

dilly-dally \dil"ly-dal`ly\, v. i. [See Dally.]
   To loiter or trifle; to waste time.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dilly-dally
    v 1: postpone doing what one should be doing; "He did not want
         to write the letter and procrastinated for days" [syn:
         procrastinate, stall, drag one's feet, drag one's
         heels, shillyshally, dilly-dally, dillydally]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "dillydally":
   abide, await, bide, bide the issue, dally, dawdle, delay, diddle,
   dilly, doodle, drag, falter, flag, goof off, halt, hang about,
   hang around, hold everything, hold on, hold your horses, lag,
   linger, loiter, lollygag, mark time, piddle, poke, put off,
   shilly-shally, sit tight, sit up, stay, stay up, stick around,
   take time, tarry, trail, wait, wait a minute, wait and see,
   waste time