Definition of breakneck
- breakneck speed
the breakneck production of naval vessels during World War II
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blistering, breathless, brisk, dizzy, fast, fleet, fleet-footed, flying, galloping, hasty, hot, lightning, nippy, quick, rapid, rapid-fire, rattling, snappy, speedy, splitting, swift, whirlwind, zippy;
: very fast : dangerously fast
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