breakneck means dangerously fast; hell-for-leather. Lexicurio rates it Rare gem — a strength score of 79 out of 100.
breakneck is pronounced /ˈbɹeɪkˌnɛk/.
Etymology
From break + neck.
adj
- Dangerously fast; hell-for-leather.“breakneck pace”
adv
- Dangerously fast.“I ran breakneck another hundred yards.”
noun
- A fall that breaks the neck.
- A dangerous steep place from which one could fall and be injured.