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• ach
  ach

  interjection

  alas; oh.
• ACH
  ACH

  abbreviation

  automated clearing houseclearinghouse: a large computer network that transfers batches of electronic funds directly between financial institutions without the use of cash, credit cards, or paper checks, thus reducing fees and enabling faster transactions, such as for recurring bill payments, direct deposit, etc.
• ACh
  ACh

  abbreviation

  acetylcholine.

ach

¹ American  

[ahkh] / ɑx /

interjection

German.

1. alas; oh.

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ACH ² American  

abbreviation

1. automated clearing houseclearinghouse: a large computer network that transfers batches of electronic funds directly between financial institutions without the use of cash, credit cards, or paper checks, thus reducing fees and enabling faster transactions, such as for recurring bill payments, direct deposit, etc.

2. Automated Clearing House Network: the national computer network for processing electronic funds transfers between financial institutions in the United States.

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ACh ³ American  

abbreviation

Biochemistry.

1. acetylcholine.

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ach British  

/ ɑːx /

interjection

1. Also: och.  an expression of surprise, impatience, disgust, etc

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Example Sentences

The 'Adorant', a mammoth ivory plaque discovered in Geißenklösterle Cave in the Ach Valley, shows a lion-human hybrid figure and is covered with rows of dots and notches.

From Science Daily • Feb. 25, 2026

The collection is set to launch on Tuesday, supported by a brand campaign which will include NFL figures such as Joe Montana, Nick Foles, Ryan Clark and Emmanuel Ach.

From The Wall Street Journal • Oct. 27, 2025

"Ach," replied the linebacker, a two-time Super Bowl winner.

From BBC • Nov. 12, 2024

Ach, I’m not smart enough to put all the pieces together, but I don’t think there’s a satisfactory solution any more.

From The Guardian • Dec. 27, 2020

“Ja, I know. Ach, you must hate me.”

From "Code Name Verity" by Elizabeth Wein