a projection jutting out from a wall to support a structure above it 托臂;梁托
(corbelled, corbelling, 美 corbeled, corbelling)
[with obj.](常作 be corbelled out )support (a structure such as an arch or balcony) on corbels 给(拱门、阳台等建筑)装上梁托
语源
late Middle English: from Old French, diminutive of corp 'crow', from Latin corvus 'raven' (perhaps because of the shape of a corbel, resembling a crow's beak)