Meaning

noun any grammatical case other than the nominative

noun a diagonally arranged abdominal muscle on either side of the torso

adjective slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled

originFrom Middle French oblique, from Latin oblīquus (also spelled oblīcus) (“slanting, sideways, indirect, envious”).

Etymology from Wiktionary, CC BY-SA 3.0