Bah definitions

bä, bă
Used to express impatient rejection or contempt.
interjection
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Used to express contempt, scorn, or disgust.
interjection
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(sometimes humorous) Expressing contempt, disgust, or bad temper.

"My website is much better than yours!" ― "Let me check... bah!!"

interjection
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(military, US) Basic Allowance for Housing.
initialism
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(law) Abbreviation of Bahamas.
pronoun
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