Definition of breakneck in English:

breakneck

Syllabification: break·neck
Pronunciation: /ˈbrākˌnek
 
/

adjective

[attributive]
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

Definition of breakneck in:

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Pronunciation: wiːn
verb
be of the opinion; think or suppose