In architecture, a sloped surface or molding, especially the slope at the base of a chimney or the angled part of an arch.
From Old French 'flanc' (side or flank), entered English architectural vocabulary in the 1400s to describe angled or sloped features.
Roofers and masons use 'flaunch' to describe that sloped concrete around chimneys—it's designed to shed water and prevent leaks at that crucial joint.
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