Drinks or medicines believed to restore health and energy, or mixers used in cocktails like gin and tonic.
From Greek tonikos meaning 'of or for stretching,' from tonos (tension/tone). The medical sense developed in the 1800s when tonics were bottled health potions.
Victorians were obsessed with tonics containing coca leaf, alcohol, and caffeine that promised to cure everything—Coca-Cola actually started as a 'brain tonic' in 1886!
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