In a speech on Wednesday, Barack Obama retracted an earlier joke which he made at the future Senate Majority Leader's expense (at a White House Correspondents Dinner) saying, "... You know actually, ah, I would enjoy having some Kentucky Bourbon, ah, with Mitch McConnell, ah <lip bite>, I don't what his preferred drink is, but ah ..."
Biting the lip (much more commonly seen with the lower lip and on one side as the President exemplifies here) is a body language signal which can have a number of meanings depending on the other nonverbals with which it is clustered. In this context the President's is biting his lip in order to partially suppress a smile.
What are the other body language scenarios where lip biting is seen?
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