ChristianAnswers.Net WebBible Encyclopedia
Satan is called the “accuser of the brethren” (Rev. 12:10. Compare Job 1:6; Zechariah 3:1), as seeking to uphold his influence among men by bringing false charges against Christians, with the purpose of weakening their influence and injuring the cause with which they are identified.
Satan was regarded by the Jews as the accuser of men before God, laying to their charge the violations of the law of which they were guilty, and demanding their punishment.
The same Greek word, rendered “accuser,” is found in John 8:10 (but omitted in the Revised King James Version); Acts 23:30, 35; 24:8; 25:16, 18. In each case it refers to one who brings a charge against another.