- slack-jawed (adj.)
[slack-jawed 词源字典]
- 1882, "over-talkative," from slack-jaw (n.) "impertinent language" (1797), from slack (adj.) + jaw (n.). Meaning "open-mouthed and speechless" from astonishment, stupidity, etc., is from 1905.[slack-jawed etymology, slack-jawed origin, 英语词源]