curve (kɜːv)  
—n  
1.  a continuously bending line that has no straight parts 
2.  something that curves or is curved, such as a bend in a road or the contour of a woman's body 
3.  the act or extent of curving; curvature 
4.  maths 
a. a system of points whose coordinates satisfy a given equation; a locus of points  
b. the graph of a function with one independent variable  
5.  a line representing data, esp statistical data, on a graph: an unemployment curve 
6.  ahead of the curve ahead of the times; ahead of schedule 
7.  behind the curve behind the times; behind schedule 
8.  short for French curve 
—vb  
9.  to take or cause to take the shape or path of a curve; bend 
Related: sinuous  
[C15: from Latin curvāre to bend, from curvus crooked]  
curvedly  
—adv  
'curvedness  
—n  
'curvy  
—adj 
curve (kûrv)
n.
A line or surface that deviates from straightness in a smooth, continuous fashion.
Something characterized by such a line or surface, especially a rounded line or contour of the human body.
A curved line representing variations in data on a graph.
curve (kûrv) Pronunciation Key

throw a curve
Surprise or outwit someone, as in They threw me a curve when they said that our department would be combined with yours. This colloquial term comes from baseball, where a pitcher tries to fool the batter by using a curve ball, which is thrown with sufficient spin to make it veer from its expected path. The term was transferred to other kinds of surprise, not necessarily unpleasant, in the mid1900s.