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Related to buttering: buttering up
Coating the faces of a weld joint prior to welding to prevent cross contamination of the weld metal and base metal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Spreading mortar on a masonry unit with a trowel.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.