Clepsydra , a term used in Treblinka extermination camp , means `` obituary '' in Polish .
If a prisoner was beaten and sustained black eyes , open wounds and severe swelling , he was called a clepsydra ( Greek for `` water clock '' ) by the other prisoners and most likely shot that evening at roll call or the next day if the bruised cheeks began to swell up .
Treblinka extermination camp