喧哗 xuānhuá hubbub
hubbub; clamor; to make a racket
How to remember 喧哗: 喧 lively + 哗 uproar = hubbub.
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How it is used
- Noisy clamor / to make a racket - 请勿喧哗 (qǐng wù xuānhuá) please keep quiet (common sign); 大声喧哗 (dàshēng xuānhuá) make a loud din.
- Refers to disruptive human noise in a place that should be quiet. Written-leaning, formal in notices.