The kanji 盛 generally conveys the idea of "to thrive," "to prosper," "to flourish," "to be in full bloom," or "abundant." It suggests a state of fullness, abundance, and vitality, often related to growth, development, or popularity. It can also imply something being at its peak or the height of its activity.

・On-yomi (音読み): ・せい (sei) ・じょう (jou) ・Kun-yomi (訓読み): ・さか(ん) (saka(n)) ・も(る) (mo(ru))

⚫︎繁盛（はんせい） Translation: prosperity; thriving; flourishing ⚫︎盛（さか）んな祭り（まつり） Translation: a lively festival; a festival in full swing ⚫︎盛（も）り上が（あ）る Translation: to become excited; to get worked up

The kanji 盛 is a 形声文字 (keisei moji), a phono-semantic compound character. The character is composed of two parts: 皿 (皿 - sara) which means "dish" and 成 (成 - sei/jou) which means "to become" or "to complete." The original meaning of the character was related to a dish being filled, implying fullness or abundance. Over time, the meaning expanded to encompass the idea of thriving, prospering, and being in full bloom. The left part of the character, 皿, is the semantic component, and the right part, 成, is the phonetic component.