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English definition of “sb's jaw drops (open)”

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sb's jaw drops (open)

If someone's jaw drops (open), they look very surprised: My jaw dropped open when she told me how old she was.
Translations of “sb's jaw drops (open)”
in Chinese (Traditional) 大吃一驚, 驚訝得張口結舌…
in Chinese (Simplified) 大吃一惊, 惊讶得张口结舌…
(Definition of sb's jaw drops (open) from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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