An acid-base indicator which is colorless in acid solution, but turns pink to red as the solution becomes alkaline. It is used medicinally as a cathartic.
Au fait
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Another one of those French expressions that have slipped into the English language. This one means to be familiar with something.
Au fait meaning & definition 1 of Au fait.
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On to it,or current with news
Au fait meaning & definition 2 of Au fait.
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