Entry 1 sense Webster, 1913 Oppressor /əp-rĕs'-ẽr/ · Op·press·or · IPA /əprˈɛsər/ 01 n. One who oppresses; one who imposes unjust burdens on others; one who harasses others with unjust laws or unreasonable severity. 1. One who oppresses; one who imposes unjust burdens on others; one who harasses others with unjust laws or unreasonable severity. “The orphan pines while the oppressor feeds.” — Shak. “To relieve the oppressed and to punish the oppressor.” — Swift.