Etymology
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weight (n.)

Old English gewiht "weighing, weight, downward force of a body, heaviness," from Proto-Germanic *wihti- (source also of Old Norse vætt, Danish vegt, Old Frisian wicht, Middle Dutch gewicht, German Gewicht), from *weg- (see weigh).

Figurative sense of "burden" is late 14c. To lose weight "get thinner" is recorded from 1961. Weight Watcher as a trademark name dates from 1960. To pull one's weight (1921) is from rowing. To throw (one's) weight around figuratively is by 1922. Weight-training is from 1945. Weight-lifting is from 1885; weight-lifter (human) from 1893.

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weight (v.)
"to load with weight," 1747 (figuratively, of the mind, from 1640s), from weight (n.). Of horses in a handicap race, 1846. Sense in statistics is recorded from 1901. Related: Weighted; weighting.
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dead-weight (n.)

also deadweight, 1650s, "weight of an inert body," from dead (adj.) + weight (n.). Hence, "a heavy or oppressive burden" (1721).

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paper-weight (n.)

"small, heavy object used to hold down loose papers," by 1832, from paper (n.) + weight (n.).

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feather-weight (n.)
also featherweight, "lightest weight allowable by rules," 1812 (earlier as simply feather, 1760), from feather (n.) + weight (n.). Originally in horse-racing; boxing use as a specific weight class dates from 1889.
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overweight (adj.)
"in excess of proper or ordinary weight," 1630s, from over- + weight (n.). Of persons, as a noun, "obesity" from 1917.
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weightless (adj.)
"having no weight," 1540s, from weight (n.) + -less. Related: Weightlessly; weightlessness (1867).
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weighty (adj.)
late 14c., "heavy;" late 15c., "important, serious, grave;" from weight (n.) + -y (2). Related: Weightiness.
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