"mellowing" in the noun sense
1. mellowing
the process of becoming mellow
"mellowing" in the verb sense
1. mellow
soften, make mellow
"Age and experience mellowed him over the years"
2. mellow, melt, mellow out
become more relaxed, easygoing, or genial
"With age, he mellowed"
3. mellow
make or grow (more) mellow
"These apples need to mellow a bit more"
"The sun mellowed the fruit"
Source: WordNet® (An amazing lexical database of English)
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