jaw dropped

Meaning

1. sb's jaw dropped / fell / sagged

   used to say that sb suddenly looked surprised, shocked or disappointed

In the movies · 2

• So I'm - my jaw dropped.Dear Zachary: A Letter to a Son About His Father2008
• - Why are you carrying that manuscript around? - You'll see, and when you do, your jaw is gonna drop.Midnight in Paris2011

From the same entry

• the jaws of death, defeat
• the jaws of a tunnel