To speak in a humble and subdued tone; to be meek and submissive.
他犯了错，在长辈面前总是低声哑气，不敢大声说话。
He made a mistake, and in front of his elders, he always spoke in a low and subdued tone, not daring to speak loudly.
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To speak in a humble and subdued tone; to be meek and submissive.