The Hebrew verb akaf (אָכַף) means "to press upon, to urge, to be urgent" — describing the forceful pressing of a matter or the urgent prodding of someone to action. It appears only once in the Old Testament (Proverbs 16:26) in a context of motivation and labor.
Proverbs 16:26 provides the sole occurrence: "A laborer's appetite works for him; his mouth urges him on." This proverb captures a profound insight about human motivation: physical hunger (nepes) is the very engine that drives a worker. God wired hunger into creation as a motivational force — it compels effort, industriousness, and the dignity of labor. The word akaf here suggests that need is not a curse but a grace-laden driver that keeps humanity engaged with the created order. Paul echoes this in 2 Thessalonians 3:10: "If a man will not work, he shall not eat."