Definify.com

Webster 1913 Edition

Breakneck

Break′neckˊ

,

Noun.

1.

A fall that breaks the neck.

2.

A steep place endangering the neck.

Break′neckˊ

,

Adj.

Producing danger of a broken neck;

as,

breakneck

speed

.

Webster 1828 Edition

Breakneck

BREAKNECK

,

Noun.

[break and neck.] A fall that breaks the neck; a steep place endangering the neck.