‘吞声’ literally means 'to swallow one’s voice'—a vivid metaphor for suppressing speech or emotion, especially in the face of injustice, sorrow, or power imbalance. The character 吞 (tūn) means 'to swallow', suggesting an active, internalized act of restraint; 声 (shēng) means 'voice' or 'sound', representing expression itself. Together, they evoke the physical and emotional effort of holding back tears, complaints, or protest.

This word is strongly associated with silent endurance, resignation, or dignified suffering—often implying unfairness or helplessness. It appears frequently in literary, historical, and formal contexts, such as classical poetry or modern essays describing oppression, grief, or social constraint. While it can describe individual restraint, it often carries a subtle moral weight: the speaker endures not out of indifference, but because speaking would be futile, dangerous, or inappropriate.