bar refers to the open field where the sons multiply and then go forth.

The attested use places bar in the setting of an open field, where sons grow strong, multiply, and then go forth.

1. Open field as a setting · dominant

   In Job 39:4, the masculine singular absolute form occurs in the clause concerning sons who grow strong and multiply; the APB renders the setting as "in the open field" before saying that they go forth and do not return to them.

   Job 39:4

In the Anselm Project Bible: In Job 39:4, the APB presents the clause with "in the open field." This identifies the verse's setting rather than proving a precise English equivalent for the term.