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The Collaborative International Dictionary of English v.0.48 (gcide)

Sofa \So"fa\, n.; pl. {Sofas}. [Ar. soffah, from saffa to
dispose in order: cf. F. sofa, It. sof[`a].]
A long seat, usually with a cushioned bottom, back, and ends;
-- much used as a comfortable piece of furniture.
[1913 Webster]

Let fall the curtains, wheel the sofa round. --Cowper.
[1913 Webster]

{Sofa bed}, a sofa so contrived that it may be extended to
form a bed; -- called also {sofa bedstead}.
[1913 Webster]