comb cut

plumb cut, ridge cut

A cut in a vertical plane, as the cut on a rafter where it butts vertically against a ridgeboard.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Tulliver, not without a particular reason, had abstained from a seventh recital of the cool retort by which Riley had shown himself too many for Dix, and how Wakem had had his comb cut for once in his life, now the business of the dam had been settled by arbitration, and how there never would have been any dispute at all about the height of water if everybody was what they should be, and Old Harry hadn't made the lawyers.
And for a time, Springfield Armory offered an "M21" version with its comb cut and elevating hardware installed to enable the shooter to raise said comb.