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English definition of “open-mouthed”

open-mouthed

adjective uk   /ˌəʊ.pənˈmaʊðd/ us    /ˌoʊ-/
with your mouth wide open, especially because you are surprised or shocked: They stared open-mouthed at the extent of the damage.
(Definition of open-mouthed from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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