slack-jawedadj.
英 'slækjɔ:d | 美
中文adj. 目瞪口呆的；发呆的
词根词源
slack-jawed (adj.)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.
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