彼(かれ)は顎(あご)に手(て)を当(あ)て、しばらく考(かんが)え込(こ)んだ。

He rested his hand on his chin and pondered for a while.

顎(あご)が外(はず)れそうなほど大(おお)きく口(くち)を開(あ)けた。

I opened my mouth so wide that my jaw felt as though it might come off.

事故(じこ)の衝撃(しょうげき)で顎(あご)を強(つよ)く