Etymology
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cozy (adj.)

"snug, comfortable, warm," 1709, colsie, originally Scottish dialect, perhaps of Scandinavian origin (compare Norwegian kose seg "be cozy"). In Britain, usually cosy. Related: Cozily; coziness. As a noun, "padded covering for a teapot to keep the heat in," 1863.

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cosy (adj.)

chiefly British form of cozy (q.v.).

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cosily (adj.)

"in a cozy manner," 1721, from British spelling of cozy (q.v.). + -ly (2).

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cose (v.)

"to make oneself cozy," 1857, back-formation from the British spelling of cozy. Related: Cosed; cosing.

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