'Curb' in the Bible

Keep a strong curb, however, on your youthful cravings; and strive for integrity, good faith, love, peace, in company with all who pray to the Lord with pure hearts.

For we all stumble and sin in many ways. If anyone does not stumble in what he says [never saying the wrong thing], he is a perfect man [fully developed in character, without serious flaws], able to bridle his whole body and rein in his entire nature [taming his human faults and weaknesses].

Curb every passion, and be on the alert. Your great accuser, the Devil, is going about like a roaring lion to see whom he can devour.