Jabot

google

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early 19th century (denoting a frill on a man's shirt): French, originally ‘crop of a bird’.

wiktionary

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Borrowed from French jabot.

etymonline

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jabot (n.)

1823, "frill of a men's shirt," from French jabot "gizzard (of a bird), frill on a shirt front" (16c.), a word of unknown origin. Klein suggests a connection with gaver "to cram, gorge," and thus ultimately with English jaw (n.). Of women's clothing from 1869.