Definition of one's jaw drops in English:

one's jaw drops

One feels or appears amazed or shocked: Laurel’s jaw dropped despite her attempts to hide her surprise
More example sentences
  • I don't normally experience moments where my jaw drops at something online.
  • Some moments, my jaw drops, I don't believe what just happened.
  • His eyebrows rise in surprise as his jaw drops.
See parent entry: jaw

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Pronunciation: ˈnɔɪs(ə)m
having an extremely offensive smell