Etymology

ach-laut

Today it means: The guttural phoneme /x/ (the voiceless velar fricative) of the German language, the sound of the letters ch in German coming immediately after a, o and u (central and back vowels), also found in other languages. Full definition →

German Ach-Laut, ach-Laut
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The story

  1. German · borrowed fromAch-Laut, ach-Laut
  2. English todayach-laut

From German Ach-Laut, ach-Laut, from ach (which has this sound) + Laut (“sound”).

Etymology from Wiktionary, CC BY-SA 4.0.