"A saber bear is most deadly when it is trapped with no hope of escape."
The saber bear (or sabre bear) was a deadly carnivore native to Qo'noS. It was most dangerous when it was trapped without hope of escape.
General Martok was hunting sabre bear on Kang's Summit when he was captured by the Dominion in 2371. (DS9: "In Purgatory's Shadow")
Martok later likened the Maquis' losing struggle against the Cardassians and the Jem'Hadar in 2373 to that of a trapped saber bear. (DS9: "Blaze of Glory")
The British spelling "sabre" was used in the script for "In Purgatory's Shadow", whereas "Blaze of Glory" used the American spelling "saber".