"toning" in the verb sense
1. tone, chant, intone
utter monotonously and repetitively and rhythmically
"The students chanted the same slogan over and over again"
2. tone, inflect, modulate
vary the pitch of one's speech
3. tone
change the color or tone of
"tone a negative"
4. tone
change to a color image
"tone a photographic image"
5. tone, tone up, strengthen
give a healthy elasticity to
"Let's tone our muscles"
Source: WordNet® (An amazing lexical database of English)
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