Become

bē̇-kum´:

(1) Greek γίνομαι, gı́nomai, used in New Testament for a change of state, corresponding to Hebrew hāyāh of Old Testament. Compare Mat 18:3 with Deu 27:9.

(2) For what is fitting, suitable, proper, in New Testament: “prépei” (Mat 3:15; Eph 5:3; 1Ti 2:10); in Old Testament, נאוה, nā’ăwāh, נאה, nā’āh, Psa 93:5: “Holiness becometh thy house.” in this sense, the adverb “becomingly” must be interpreted: “Walk becomingly toward them that are without” (1Th 4:12), i.e. in a way that is consistent with your profession.