|Noah Webster's Dictionary|
1. (v. t.) To renounce or dissolve all bonds of affiance, faith, or obligation with; to reject, refuse, or renounce.
2. (v. t.) To provoke to combat or strife; to call out to combat; to challenge; to dare; to brave; to set at defiance; to treat with contempt; as, to defy an enemy; to defy the power of a magistrate; to defy the arguments of an opponent; to defy public opinion.
3. (n.) A challenge.
Int. Standard Bible Encyclopedia
de-fi' (charaph, za`am): In 1 Samuel 17:10, 25, 26, 36, 45 (the story of David and Goliath) and kindred passages, this word is used in its most familiar sense-"to taunt," "challenge to combat" (Hebrew charaph). In Numbers 23:7, 8 "denounce" would be a better translation than "defy" (Hebrew za`am).
Defy (10 Occurrences)
Numbers 23:7 He took up his parable, and said, "From Aram has Balak brought me, the king of Moab from the mountains of the East. Come, curse Jacob for me. Come, defy Israel. (WEB KJV ASV WBS)
Numbers 23:8 How shall I curse whom God has not cursed? How shall I defy whom Yahweh has not defied? (WEB KJV ASV WBS)
1 Samuel 17:10 The Philistine said, "I defy the armies of Israel this day! Give me a man, that we may fight together!" (WEB KJV ASV WBS NAS RSV NIV)
1 Samuel 17:25 The men of Israel said, "Have you seen this man who is come up? He has surely come up to defy Israel. It shall be, that the man who kills him, the king will enrich him with great riches, and will give him his daughter, and make his father's house free in Israel." (WEB KJV ASV DBY WBS NAS RSV NIV)
1 Samuel 17:26 David spoke to the men who stood by him, saying, "What shall be done to the man who kills this Philistine, and takes away the reproach from Israel? For who is this uncircumcised Philistine, that he should defy the armies of the living God?" (WEB KJV ASV DBY WBS RSV NIV)
2 Kings 19:4 It may be Yahweh your God will hear all the words of Rabshakeh, whom the king of Assyria his master has sent to defy the living God, and will rebuke the words which Yahweh your God has heard. Therefore lift up your prayer for the remnant that is left.'" (WEB ASV)
2 Kings 19:16 Incline your ear, Yahweh, and hear. Open your eyes, Yahweh, and see. Hear the words of Sennacherib, with which he has sent to defy the living God. (WEB ASV)
Psalms 139:20 For they go against you with evil designs, and your haters make sport of your name. (See RSV)
Isaiah 37:4 It may be Yahweh your God will hear the words of Rabshakeh, whom the king of Assyria his master has sent to defy the living God, and will rebuke the words which Yahweh your God has heard. Therefore lift up your prayer for the remnant that is left.'" (WEB ASV)
Isaiah 37:17 Turn your ear, Yahweh, and hear. Open your eyes, Yahweh, and behold. Hear all of the words of Sennacherib, who has sent to defy the living God. (WEB ASV)