buckle

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buckle

[′bək·əl]
(graphic arts)
Curvature in a film that has been stored at an improper humidity.
(metallurgy)
An up-and-down wrinkle on the surface of a metal bar or sheet.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

buckle

1. Distortion of the surfaces of a beam or girder under load; caused by unequal distribution of weight, temperature, or moisture, or the lack of uniform texture.
2. Distortion of the surface of a sheet of material, such as a bulge or wrinkle in asphalt prepared roofing.
3. A brotch.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.