BREAKNECK
breakneck
(adjective) moving at very high speed; “a breakneck pace”
Source: WordNet® 3.1
Etymology
Adjective
breakneck (comparative more breakneck, superlative most breakneck)
Dangerously fast; hell-for-leather.
Noun
breakneck (plural breaknecks)
A fall that breaks the neck.
A dangerous steep place from which one could fall.
Anagrams
• creekbank
Source: Wiktionary
Break"neck`, n.
1. A fall that breaks the neck.
2. A steep place endangering the neck.
Break"neck`, a.
Definition: Producing danger of a broken neck; as, breakneck speed.
Source: Webster’s Unabridged Dictionary 1913 Edition