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tone-up

American  
[tohn-uhp] / ˈtoʊnˌʌp /

noun

  1. an exercise for toning up one's body.

tone up British  

verb

  1. (adverb) to make or become more vigorous, healthy, etc

    exercise tones up the muscles
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of tone-up

Noun use of the verb phrase tone up

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.