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.