Ton
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Middle English: variant of tun, both spellings being used for the container and the weight. The senses were differentiated in the late 17th century.
wiktionary
Variant of tun(“cask”), influenced by Old French tonne(“ton”).
Borrowed from French ton(“manner”), from Latin tonus. Doublet of tone, tune, and tonus.
ton (plural tons)
etymonline
ton (n.1)
"measure of weight," late 14c. The quantity necessary to fill a tun or cask of wine, thus identical to tun (q.v.). The spelling difference became firmly established 18c. Ton of bricks in the colloquial figurative sense of what you come down on someone like is from 1884.
ton (n.2)
"prevailing mode, style, fashionable ways," 1769, from French ton (see tone (n.)).
