"maturating" in the verb sense
1. mature, maturate, grow
develop and reach maturity undergo maturation
"He matured fast"
"The child grew fast"
2. senesce, age, get on, mature, maturate
grow old or older
"She aged gracefully"
"we age every day
3. fester, maturate, suppurate
ripen and generate pus
"her wounds are festering"
Source: WordNet® (An amazing lexical database of English)
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