Abbreviation of oratio obliqua.

Not erect or perpendicular; not parallel to, or at right angles from, the base / Not straightforward; obscure or confusing / disingenuous; underhand; morally corrupt

(geometry) An oblique line. / (typography) Synonym of slash ⟨/⟩. / (grammar) The oblique case.

(intransitive) To deviate from a perpendicular line; to become askew;

(geometry) A line that, meeting or tending to meet another, makes oblique angles with it.

(architecture) An arch whose span is not at right angles to the face.

(military) Fire whose direction is not perpendicular to the line fired at.

a skew bridge

(projection) a circle whose plane is oblique to the axis of the primitive plane

(military) A step in marching, by which a soldier, while advancing, gradually takes ground to the right or left at an angle of about 25 degrees.