v. to hunger, long after, esp. violence or destruction
n. hunger, a compulsion driven by wrath or power

Alduin, feyn do jun, kruziik vokun staadnau, voth aan bahlok wah diivon fin lein!
Alduin, Bane of Kings, ancient shadow unbound, with a hunger to swallow the world!
(Book, Songs of Skyrim)

Hin sil fen nahkip bahloki.
Your soul will feed my hunger.
(Alduin, 000ED360)

Evenaar bahlok. There are many hungers it is better to deny than to feed.
Extinguish (your) hunger. There are many hungers it is better to deny than to feed.
(Paarthurnax, 0003F9E2)

As dragons do not experience mortal hunger, bahlok is better defined as any compulsion driven by wrath, especially destructive in nature or to assert power.

May derive from bah ‘wrath’.