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tonic

 
 
/ˈtɒnɪk/ noun

Definition

DRINK [C, U] (also tonic water) a drink with bubbles in it that has a bitter taste and is often added to alcoholic drinks
FEEL BETTER [no plural] something that makes you feel better: Spending time with Leo is always a tonic.
(Definition of tonic noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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