Basic Guidelines For English Spellings
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(A name for) a blend of English and Yiddish, especially one spoken in the United States; a form of English containing many Yiddishisms or a form of Yiddish containing many Anglicisms.
Especially of language: blending English and Yiddish features or characteristics; of or relating to Yinglish.
1950s. From Yi- + -nglish.