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cusp noun

  /kʌsp/
  • (figuratively) An important moment when a decision is made that will determine future events.
 [[перело́мный]] [[моме́нт]]
  • (geometry) A point of a curve where the curve is continuous but has no derivative, but such that it has a derivative at every nearby point.
 [[то́чка]] [[разрыв|разры́ва]]
  • A sharp point or pointed end.
 ко́нчик, остриё, пик
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