. Coast is derived from Middle English coste, from Old French coste (modern French côte), from Latin costa, from Proto-Indo-European *kost-.
. from Anglo-Norman, Old French costoier (modern French côtoyer), from Latin costicāre, from costa; see further at etymology 1.
Sense 2.1 (“small stand or tray”) is from the fact that the object and the decanter or wine bottle on it “coast” or travel around a tabletop from person to person. Sense 2.2.2 (“useless compact disc or DVD”) refers to the fact that the object is only useful as a drink coaster.
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