Doubts that arise when an unsubstantiated rumor is repeated often enough, causing even the most trusting person to waver; literally 'the doubt of throwing down the weaving shuttle'.

(literary) Even the strongest confidence can be shaken by persistent rumors; literally "Zeng's mother threw down her shuttle". References the story of [[曾参|曾參|zeng1 shen1]]'s mother who, despite her son's virtue, eventually believed reports he was a murderer and fled her loom.