quilt; bedspread; bedcover
A thick cover placed over a futon or bed for warmth; similar to a Western quilt or bedspread.
On cold nights, I put on another quilt.
kotatsu quilt cover
Specifically the decorative cover placed over the quilt of a kotatsu (heated table).
See also: こたつ
A loose outer garment worn over clothes; somewhat old-fashioned or specialized, often used in historical or work contexts.
This cover is meant to be placed over the kotatsu quilt.
The craftsman wore a smock over his work clothes.
overshot water wheel
Standard kanji spelling.
Variant without okurigana; less common but acceptable.
Compound of 上 (うわ, 'upper') + 掛け (かけ, 'covering'). The reading うわがけ is standard; うわかけ is a less common variant.