in·cur·vate /ˈɪnˌkɚ/
(vt.)(vi.)(使)向內彎曲,(使)彎曲(a.)向內彎曲的,內曲的
In·cur·vate a. Curved; bent; crooked.
In·cur·vate v. t. [imp. & p. p. Incurvated p. pr. & vb. n. Incurvating.] To turn from a straight line or course; to bend; to crook.
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incurvate
adj : bent into or having an inward curve [syn: incurved]
v 1: bend inwards; "The body incurvates a little at the back"
2: cause to curve inward; "gravity incurvates the rays"