someone's jaw drops (open)
US /ˈsʌm.wʌnz dʒɔː drɑps (ˈoʊ.pən)/
UK /ˈsʌm.wʌnz dʒɔː drɑps (ˈoʊ.pən)/

1.
rahang jatuh, terkejut
used to say that someone looks very surprised or shocked
:
•
When she announced her engagement, everyone's jaw dropped.
Ketika dia mengumumkan pertunangannya, rahang semua orang jatuh.
•
My jaw dropped open when I saw the price of the new car.
Rahangku jatuh terbuka ketika aku melihat harga mobil baru itu.