break·neck /ˈbrekˈnɛk/
(a.)要使頸骨折斷似的,非常危險的
Break·neck n.
1. A fall that breaks the neck.
2. A steep place endangering the neck.
Break·neck a. Producing danger of a broken neck; as, breakneck speed.
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breakneck
adj : used of speed; "a breakneck pace"