en_tn_condensed/jdg/15/15.md

a fresh jawbone

This means that the donkey had died very recently and its bones had not yet begun to decay. A jawbone is the bone in which the lower rows of teeth are set.

a thousand men

"1,000 men" (See: rc://en/ta/man/translate/translate-numbers)

the jawbone of a donkey

"a donkey's jawbone"

heaps upon heaps

This phrase describes how many people Samson killed. There were enough bodies to make large piles of bodies. AT: "I have made heaps of dead bodies" (See: rc://en/ta/man/translate/figs-explicit)