Dictionary.com definitions:
What does it mean to “overcome”?
1. to gain the victory; win; conquer
2. to prevail over (opposition, a debility, temptations, etc.);surmount
What does it mean to be an “overcomer”?
1. a person who prevails in spite of opposition, difficulties, weakness, etc.[The situation is very frustrating, but I’ve decided to become an overcomer;I am pressing on.]
2. a person who defeats someone or something in a conflict or struggle [The saints are the overcomers of the Evil One.]
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Overcoming is through Faith in Jesus Christ as your Saviour.
AND Put on the whole armor of God, that ye may be able to stand against the wiles of the devil.
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Finally, my brethren, be strong in the Lord, and in the power of his might. Put on the whole armor of God, that ye may be able to stand against the wiles of the devil. For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. …
[These pieces are described in Ephesians as follows: loins girt with truth (belt of truth), breastplate of righteousness, shoes with the preparation of the walking in the spirit, shield of faith, helmet of salvation, the sword of the Scriptures of God and prayer in the spirit activates the armor of God.] https://www.bibleinfo.com/en/questions/armor-of-god — When you give yourself to Jesus and “put on” His righteousness, you are clothed in the whole armor of God.
John 16:33 KJV
These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.
Romans 12:21 KJV
Be not overcome of evil, but overcome evil with good.
1 John 4:4 KJV
Ye are of God, little children, and have overcome them: because greater is he that is in you, than he that is in the world.
1 John 5:4 KJV
For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith.
1 John 5:5 KJV
Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?
Revelation 2:26 KJV
And he that overcometh, and keepeth my works unto the end, to him will I give power over the nations.
Revelation 3:5 KJV
He that overcometh, the same shall be clothed in white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.
Revelation 3:12 KJV
Him that overcometh will I make a pillar in the temple of my God, and he shall go no more out: and I will write upon him the name of my God, and the name of the city of my God, which is new Jerusalem, which cometh down out of heaven from my God: and I will write upon him my new name.