• (n.) A leather case or pocket worn by cavalry at the left side, suspended from the sword belt.
Sa'bre·tasche` noun [ French sabretache , German säbeltasche ; säbel saber + tasche a pocket.] (Mil.) A leather case or pocket worn by cavalry at the left side, suspended from the sword belt. Campbell (Dict. Mil. Sci.). 
A sabretasche is a leather case or pocket formerly worn by cavalry at the left side, suspended from the sword belt.