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13.
When Roman gladiators received the thumbs down signal, it meant that a he was to live. It signified that the guards were to put their swords into the ground.
Although I do not remember the name of the program, it was on the History Channel hosted by Peter Weller and he explained that thumbs down has been misinterpreted by Hollywood.
by interested_me August 31, 2007
 
22.
What I'm going to break the record for, most thumbs downs in a definition!
So keep those thumbs downs coming.
by Leruho Kdfcoi November 19, 2006
 
23.
What people won't give this definition.
This definition rocks, its so clear!
by Gooser March 22, 2005