breakneck

The definition of breakneck is something that is moving really, dangerously fast.

(adjective)

Driving at 100 miles per hour is an example of driving at breakneck speed.

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See breakneck in Webster's New World College Dictionary

adjective

very fast, reckless, dangerous, etc.: said of speed, pace, etc.

See breakneck in American Heritage Dictionary 4

adjective
  1. Dangerously fast: a breakneck pace.
  2. Likely to cause an accident: a breakneck curve.

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