en_tn/job/15/17.md

I will show you

This is an idiom. AT: "I will explain to you" or "I will make it clear to you" (See: rc://en/ta/man/translate/figs-idiom)

I will announce

"I will declare"

their ancestors did not hide

Eliphaz emphasizes that their ancestors purposefully taught them these things. AT: "their ancestors taught openly" (See: rc://en/ta/man/translate/figs-litotes)