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.
Thesaurus: synonyms and related words
Surprised
- aback
- agape
- aghast
- amazed
- appal
- flabbergast
- ghost
- gobsmacked
- goggle-eyed
- headlight
- horror
- horror of horrors idiom
- jaw
- jump/leap out of your skin idiom
- open-mouthed
- palpitation
- round-eyed
- shock
- slack-jawed
- staggered
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