Merriam-Webster Collegiate Dictionary - welsh

 also welch  intransitive verb  Etymology: probably from Welsh, adjective  Date: 1905  1. sometimes offensive to avoid payment — used with on  2. sometimes offensive to break one's word ; renege  • ~er noun, sometimes offensive WELSH  also Welch  noun  Etymology: Middle English Walsche, Welsse, from walisch, welisch, adjective, ~, from Old English w?lisc, welisc foreign, British, ~, from Old English Wealh foreigner, Briton, ~man, of Celtic origin; akin to the source of Latin Volcae, a Celtic people of southeastern Gaul  Date: before 12th century  1. the Celtic language of the ~ people  2. plural in construction the natives or inhabitants of Wales  3. ~ pony  • ~ also Welch adjective