Tighten his jaw

Posted by ESC on August 30, 2007

In Reply to: Tighten his jaw posted by Dora on August 30, 2007

: What does someone exactly do, if he "tightens his jaw"?
: The context is a lecture, the man giving the speech is quite tired of it already.

: "He tightened his jaw, coughed and drew himself up one last time"

It is an indication that he is determined, resolute.