Basic Guidelines For English Spellings
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1US Woodworking
Originally: extra or excess wood, especially the additional allowance needed when making a joint. Now: the amount of wood by which a floorboard of an uneven floor exceeds its neighbour in height; the condition of irregularity in a set of adjacent floorboards; also called lippage.
2Forestry
= "overstorey".
Mid 19th century. From over- + wood.