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.
Unstop
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To take the stopple or stopper from; as, to unstop a
bottle or a cask.
Unstop meaning & definition 1 of Unstop.
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Free (something) from obstruction.
Unstop meaning & definition 2 of Unstop.
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