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Old English sum þinge; see some + thing. Hyphenated from c.1300; one word from 17c. Formerly common as an adverb (e.g. something like). Meaning "some liquor, food, etc." is from 1570s. Meaning "a thing worthy of consideration" is from 1580s; emphatic form something else is from 1909. Phrase something for nothing is from 1869. To make something of is from 1778.
Something or someone very effective, impressive, etc: He is some pumpkins (1846+)