|Noah Webster's Dictionary|
(v. t.) To refuse to allow; to deny the force or validity of; to disown and reject; as, the judge disallowed the executor's charge.
Int. Standard Bible Encyclopedia
dis-a-lou': "To disallow" as used in the Scriptures means either "to oppose," "not permit" (Hebrew no', Numbers 30:5, 8, 11), or "to reject" (Greek apodokimazo, literally, "to consider useless," 1 Peter 2:4, 7 the King James Version, the Revised Version (British and American) "rejected").
Disallow (3 Occurrences)
Numbers 30:5 But if her father disallow her in the day that he hears, none of her vows, or of her bonds with which she has bound her soul, shall stand: and Yahweh will forgive her, because her father disallowed her. (WEB KJV JPS ASV WBS YLT)
Numbers 30:8 But if her husband disallow her in the day that he hears it, then he shall make void her vow which is on her, and the rash utterance of her lips, with which she has bound her soul: and Yahweh will forgive her. (WEB KJV JPS ASV WBS YLT)
Numbers 30:11 and her husband heard it, and held his peace at her, and didn't disallow her; then all her vows shall stand, and every bond with which she bound her soul shall stand. (WEB KJV JPS ASV WBS YLT)