Definition of breakneck in English:

breakneck

Line breaks: break|neck
Pronunciation: /ˈbreɪknɛk
 
/

adjective

Dangerously or extremely fast: he drove at breakneck speed
More example sentences
  • Breathlessly we run faster and faster at a breakneck speed to a destination we neither know nor can ever reach.
  • It's both breakneck fast and much funnier than you would think.
  • The players had been aware that this could pose the biggest test to the top-of-the-table status and came out of the blocks at breakneck speed.
Synonyms
extremely fast, high-speed, lightning, whirlwind, rapid, speedy; dangerously fast, reckless, dangerous, excessive, precipitate, headlongdangerously fast, at full speed, at full tilt, at full pelt, flat out, as fast as one's legs can carry one; Frenchventre à terre
informal hell for leather, at a lick, like the wind, like a bat out of hell, like a bomb, like greased lightning

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