Katachraomai describes using something to the full or exhausting it in relation to the world or one’s authority.

The two attested clauses present katachraomai as using something to the point of full consumption or exhaustion: the world is not to be treated as something being used up, and authority connected with the gospel is not to be used up.

1. Using to the point of exhaustion · dominant

   In 1 Corinthians 7:31, the present middle participle occurs in the contrast between using the world and not using it up; the APB renders the clause “those who use the world as though not using it up.” In 1 Corinthians 9:18, the aorist middle infinitive states the aim of not exhausting authority in connection with the gospel; the APB renders “so as not to use up my authority in the gospel.”

   1 Corinthians 7:311 Corinthians 9:18

In the Anselm Project Bible: The APB presents the relevant clauses with “using it up” in 1 Corinthians 7:31 and “use up my authority” in 1 Corinthians 9:18. These renderings confirm the clauses’ overall presentation rather than establish a finer distinction.