poleaxe

Short definition from Wiktionary

Noun

1. 1
   An ax having both a blade and a hammer face; used to slaughter cattle.
2. 2
   A long-handled battle axe, being a combination of ax, hammer and pike.

Verb

1. 1
   To fell someone with, or as if with, a poleaxe.
2. 2
   To astonish; to shock or surprise utterly.
3. 3
   To stymie, thwart, cripple, paralyze.