listen to the pronunciation of breakneck
Englisch - Englisch
Dangerously fast; hell-for-leather

He came running around the corner at a breakneck pace and couldn't stop in time to avoid hitting the fruit stand.

A fall that breaks the neck
{s} with great speed; dangerous
Producing danger of a broken neck; as, breakneck speed
A steep place endangering the neck
used of speed; "a breakneck pace
used of speed; "a breakneck pace"
If you say that something happens or travels at breakneck speed, you mean that it happens or travels very fast. Jack drove to Mayfair at breakneck speed. at breakneck speed/pace extremely and often dangerously fast
at breakneck speed
Very quickly and forcefully
at breakneck speed
at high speed, at great speed