a line that gradually bends like part of a circle
the curve of her hips
a sweeping curve of railroad track
a line on a graph that gradually bends and represents a change in the amount or level of something:
The curve illustrates costs per capita.
The market demand curve has increased.
a bend in a road, river etc:
The car took the curve much too quickly.
4DS also curve ball
in baseball, a ball that spins and moves in a curve when it is thrown, so that it is difficult to hit
5 American English
to surprise someone with a question or problem that is difficult to deal with