Is 'muesli' English, or is it actually German (Swiss)?

'Muesli' is a word borrowed from German (Swiss) 'Müesli'. The word entered the English language some time around 1939.

muesli [noun] [1939]

A breakfast cereal of Swiss origin consisting of rolled oats, nuts, and fruit

See 'muesli' on the Loan Words Map

See more loan words from German (Swiss).

Etymology: German dialect (Swiss) 'Müsli' diminutive of German 'Mus' soft food, mush, from Old High German 'muos;' akin to Old English 'mōs' food and probably to Old English 'mete' food

See more loan words from 1930s.