blanket (n.)

c. 1300, "coarse white woolen stuff," also "a large oblong piece of woolen cloth used for warmth as a bed-covering" (also as a cover for horses), from Old French blanchet "light wool or flannel cloth; an article made of this material," diminutive of blanc "white" (see blank (adj.)), which had a secondary sense of "a white cloth."

As an adjective, "providing for a number of contingencies," 1886 (blanket-clause in a contract). Wet blanket (1830) is from the notion of a person who throws a damper on social situations in the way a wet blanket smothers a fire. In U.S. history, a blanket Indian (1859) was one using the traditional garment instead of wearing Western dress.

Only 26,000 blanket Indians are left in the United States. [Atlantic Monthly, March 1906]

blanket (v.)

c. 1600, "to cover with or as with a blanket;" also "to toss in a blanket" (as punishment), from blanket (n.). Related: Blanketed; blanketing.

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Definitions of blanket from WordNet
blanket (n.)
bedding that keeps a person warm in bed;
Synonyms: cover
blanket (n.)
anything that covers;
there was a blanket of snow
Synonyms: mantle
blanket (n.)
a layer of lead surrounding the highly reactive core of a nuclear reactor;
blanket (v.)
cover as if with a blanket;
snow blanketed the fields
blanket (v.)
form a blanket-like cover (over);
blanket (adj.)
broad in scope or content; "a panoptic study of Soviet nationality"- T.G.Winner;
blanket sanctions against human-rights violators
Synonyms: across-the-board / all-embracing / all-encompassing / all-inclusive / broad / encompassing / extensive / panoptic / wide