noun, sometimes capitalized A
\ ˈäḵ-ˌlau̇t \
plural -s

Definition of ach-laut 

: the voiceless velar fricative sound represented by the ch of German ach or the ch of Scottish loch, phonemically often allophonic with the ich-laut

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First Known Use of ach-laut

1889, in the meaning defined above

History and Etymology for ach-laut

German, from ach ah, alas + laut sound, from Middle High German lūt; akin to Old English hlūd loud

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The first known use of ach-laut was in 1889

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