The Collaborative International Dictionary of English v.0.48:

blitzkrieg \blitz"krieg\ (bl[i^]tz"kr[=e]g), n. [German, blitz
   lightning + krieg war.]
   an overwhelming all-out attack with infantry, armor, and air
   forces, especially by surprise against an unprepared enemy.
   [PJC]

The Collaborative International Dictionary of English v.0.48:

blitzkrieg \blitz"krieg\ v.
   to fight a quick and surprising war.

   Syn: fight a blitzkrieg.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

blitzkrieg
    n 1: a swift and violent military offensive with intensive
         aerial bombardment [syn: blitz, blitzkrieg]
    v 1: fight a quick and surprising war

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "blitzkrieg":
   aggravated assault, aggression, air raid, amphibious attack,
   armed assault, assailing, assailment, assault, attack,
   banzai attack, blitz, bombardment, breakthrough, cannonade, charge,
   counterattack, counteroffensive, coup de main, crippling attack,
   dead set at, descent on, diversion, diversionary attack, drive,
   flank attack, frontal attack, gas attack, head-on attack,
   infiltration, lightning attack, lightning war, mass attack,
   megadeath, mugging, offense, offensive, onset, onslaught, overkill,
   panzer warfare, push, run against, run at, rush, sally,
   shock tactics, sortie, strafe, strafing, strike,
   unprovoked assault