a curved line or similargraphic representation showing variations occurring or expected to occur.(colloquial) a deception or trick. The origin of the term is possibly the "curve ball" in the sport of baseball, a method of pitching (throwing) the ball in such a way that it swerves just before it reaches the batter, making it difficult for him to hit. Our understanding must include the understanding of whether this is good dope or bad dope, whether this is the straightdata or this is data with a curve.a change in the form of (a word) as in number, case, gender, etc. You start dropping s's off of everything; or get somebody with a Japanese curve; you get somebody doing something that is a little bit offbeat in pronunciation -somebody from Boston. -Comm Cycles in Auditing (25 July 63)an unexpected contrary datum; a shift in reality. Curve itself is also the ordinary dictionary meaning. -LRHDefinitionNotes.(colloquial) a deception or trick. From the term ihcurve balllv in the sport of baseball, referring to a method of pitching (throwing) the ball in such a way that it swerves just before it reaches the batter, making it difficult for him to hit.