In heraldry, covered with a pattern of V-shaped bands repeated across a shield or surface.
From chevron (a V-shaped band) + -y (adjective suffix). Chevron comes from Old French, ultimately from Latin capreolus meaning 'rafter,' which resembles the V-shape.
Medieval heralds loved describing patterns with -y suffixes, and chevronny was their way of saying 'covered in Vs'—it's like saying 'striped' but with sharp angles instead of straight lines.
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