Think of something growing. The word is borrowed straight from Italian crescendo, which is the verb crescere, to grow, in its -ing form: growing, in progress, not finished. Put that on sound and you get volume climbing step by step. Put it on an event or a feeling and you get something gathering force over days. The one thing the word always insists on is the climb itself, which is why careful writers resist using it for the single loudest moment at the top.
From the word’s history
Borrowed from Italian crescendo, the gerund of crescere, to grow or to increase. Italian has long supplied European musical terms, which is why this one arrived through music.
借自義大利文 crescendo，是動詞 crescere（生長、增加）的 gerund 形式。歐洲音樂術語長期使用義大利文，所以這個字是從音樂這條路進入英文的。
Wiktionary, "crescendo"
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