French, alteration of biche de mer, from Portuguese bicho do mar, literally, sea worm
1783, in the meaning defined at sense 1
“Bêche-de-mer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/b%C3%AAche-de-mer. Accessed 11 Dec. 2023.
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