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Not erect or perpendicular; not parallel to, or at right angles from, the base.
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Not straightforward; indirect; by implication; (sometimes even) obscure, ambiguous, or confusing.
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Disingenuous; underhand; morally corrupt.
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Not direct in descent; not following the line of father and son; collateral.
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(botany, of leaves) Having the base of the blade asymmetrical, with one side lower than the other.
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(botany, of branches or roots) Growing at an angle that is neither vertical nor horizontal.
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(grammar) Pertaining to the oblique case (non-nominative).
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(grammar, of speech or narration) Indirect; employing the actual words of the speaker but as related by a third person, having the first person in pronoun and verb converted into the third person and adverbs of present time into the past, etc.
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(music) Employing oblique motion, motion or progression in which one part (voice) stays on the same note while another ascends or descends.