en_tn/pro/07/23.md

like an ox going ... into a snare

The naive and unsuspecting way the young man follows the adulteress is compared to the way three animals are unaware of the danger they are in. (See: rc://en/ta/man/translate/figs-simile)

until an arrow pierces through its liver

This passage implies that a hunter has trapped the deer in order to shoot it with arrows. Alternate translation: "until a hunter shoots it in its most important part" (See: rc://en/ta/man/translate/figs-explicit)

liver

Here this organ represents a very important part of the deer's body.

it would cost his life

This is a way of saying that this person will die as a result. Alternate translation: "it would kill him" or "he would die soon" (See: rc://en/ta/man/translate/figs-idiom)