tone up
verb
Definitions
To cause to give a higher tone or sound; to give a higher tone to; to make more intense; to heighten; to strengthen.
To firm and strengthen the muscles of the body by regular exercise.
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Definitions
To cause to give a higher tone or sound; to give a higher tone to; to make more intense; to heighten; to strengthen.
To firm and strengthen the muscles of the body by regular exercise.