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.
Horse guards
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A body of cavalry so called; esp., a British regiment, calledthe Royal Horse Guards, which furnishes guards of state for thesovereign. The Horse Guards, a name given to the former headquartersof the commander in chief of the British army, at Whitehall inLondon.
Horse guards meaning & definition 1 of Horse guards.
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