1jaw 
/ˈʤɑ:/ noun
plural jaws /ˈʤɑ:/ noun 1 [count] a : either one of the two bones of the face where teeth grow
▪ He broke his upper/lower jaw. ▪ The crocodile tried to grab him in its jaws. [=mouth] ▪ the jaws of a tiger/shark — often used figuratively ▪ He barely escaped from the jaws of death. [=he barely escaped death] ▪ The team was able to snatch victory from the jaws of defeat [=the team won] by scoring in the final seconds of the game. — see picture at face
b : the lower part of a person's face — usually singular ▪ I'd like to give that guy a punch in the jaw. 2 jaws [plural] : two parts of a machine or tool that open and close to hold or crush something
▪ the jaws of a vise
▪ He broke his upper/lower jaw. ▪ The crocodile tried to grab him in its jaws. [=mouth] ▪ the jaws of a tiger/shark — often used figuratively ▪ He barely escaped from the jaws of death. [=he barely escaped death] ▪ The team was able to snatch victory from the jaws of defeat [=the team won] by scoring in the final seconds of the game. — see picture at face
b : the lower part of a person's face — usually singular ▪ I'd like to give that guy a punch in the jaw.
▪ the jaws of a vise
jaw drops
◊If your jaw drops, you open your mouth in a way that shows you are very surprised or shocked.
▪ His jaw dropped when he heard who had won.
▪ His jaw dropped when he heard who had won.
