Where does “muttonish” come from?

muttonish (English) comes from English mutton, from Middle English motoun, from Old French mouton, from Vulgar Latin molto, from Gaulish multon-, from Proto-Celtic moltos, from Proto-Indo-European (h₂)moldus, from Proto-Indo-European mel- — to strengthen; to bind; to change, exchange.

Ancestry of “muttonish”, step by step

muttonish traces back through two separate lines of ancestry.

via English mutton

StepLanguageWordMeaning
1EnglishmuttonThe flesh of sheep used as food; The flesh of...
2Middle EnglishmotounThe meat of sheep or a piece of it; mutton; A...
3Old Frenchmoutonsheep; mutton
4Vulgar Latinmoltowether
5Gaulishmulton-sheep
6Proto-Celticmoltosram, wether
7Proto-Indo-European(h₂)moldussoft, weak
8Proto-Indo-Europeanmel-soft; tender; weak; to deceive; to rub
9Proto-Indo-Europeanmey-to strengthen; to bind; to change, exchange

via English ish

StepLanguageWordMeaning
1EnglishishPronunciation spelling of is; somewhat,...
2English-ishTypical of, similar to, being like; Somewhat,...
3Middle English-ishAlternative form of -yssh
4Old English-isċ-ish
5Proto-West Germanic-iskCreates adjectives from nouns
6Proto-Germanic-iskazForms adjectives from nouns with the sense of...
7Proto-Indo-European-iskosCharacteristic of, typical of, pertaining to
Every word from Proto-Indo-European mey-