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.
Tinder!
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The word one hears in their head, sounds like someone yelling TIMBER! when a tree falls, when you realize that your tender Tinder relationship has hit the rocks and is about to go up in flames
Tinder! meaning & definition 1 of Tinder!.
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