Any uncomfortable moment during a political stump speech.
"Did you notice that Chris Christie barely even mentioned Mitt Romney in his speech at the Republican National Convention?"

"Yeah, it was a total empty chair."
by dscully September 4, 2012
Verb: To display and bring attention to an empty chair/podium from someone who chickened out of an interview/debate that they promised to do as a method of humiliation.
Boris Johnson refuses to show up for the second Leaders debate about climate change, so a petition has been made for Channel 4 to empty chair him.
by JourneyLT November 22, 2019