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yarum, yerim, yerrim, yerum, yoarum, yorum noun milk: paplers and yerrim [porridge and milk] la16-. Compare been yerum etymology: origin obscure but perhaps a development of Scots yirn ‘of milk, to form curds with rennet and the application of heat’; also collected by EMcC/PS and RD; attested in Shelta; yerim attested by Galloway and Perthshire and Argyleshire Tinkler-Gypsies, SR, BS in TDITA and SS note:

Lexicon Balatronicum (1811) and Grose and Egan (1823) attest the form yarum ‘milk’ as ‘Cant’.

Canadian Paul Pope (2013) also cites the form yerrum with the same meaning.