Definitions for open-mouthed
Random House Webster's College Dictionary
having the mouth open.
gaping, as with surprise or astonishment.
having a wide mouth, as a pitcher or jar.
Origin of open-mouthed:
o′pen-mouth′ed•ly-ˈmaʊ ðɪd li, -ˈmaʊθt li(adv.)
Talkative, speaking freely.
With the mouth open.
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