Definition of tonify verb from the Oxford Advanced American Dictionary

 

tonify

 verb
verb
NAmE//ˈtoʊnəˌfaɪ//
 
tonify somethingVerb Forms present simple I / you / we / they tonify
 
he / she / it tonifies
 
past simple tonified
 
-ing form tonifying
 
 
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to make a part of the body firmer, smoother, and stronger, by exercise or by applying special creams, etc.
See the Oxford Advanced Learner's Dictionary entry: tonify