Curve \Curve\, v. t. [imp. & p. p. Curved (k?rvd); p. pr. & vb. n. Curving.]

[L. curvare., fr. curvus. See Curve, a., Curb.]

To bend; to crook; as, to curve a line; to curve a pipe; to cause to swerve from a straight course; as, to curve a ball in pitching it.

Source: Webster's Revised Unabridged Dictionary (1913)