The Collaborative International Dictionary of English v.0.48:

Depose \De*pose"\, v. i.
   To bear witness; to testify under oath; to make deposition.
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         Then, seeing't was he that made you to despose,
         Your oath, my lord, is vain and frivolous. --Shak.
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The Collaborative International Dictionary of English v.0.48:

Depose \De*pose"\, v. t. [imp. & p. p. Deposed; p. pr. & vb.
   n. Deposing.][FF. d['e]poser, in the sense of L. deponere
   to put down; but from pref. d['e]- (L. de) + poser to place.
   See Pose, Pause.]
   1. To lay down; to divest one's self of; to lay aside. [Obs.]
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            Thus when the state one Edward did depose,
            A greater Edward in his room arose.   --Dryden.
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   2. To let fall; to deposit. [Obs.]
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            Additional mud deposed upon it.       --Woodward.
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   3. To remove from a throne or other high station; to
      dethrone; to divest or deprive of office.
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            A tyrant over his subjects, and therefore worthy to
            be deposed.                           --Prynne.
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   4. To testify under oath; to bear testimony to; -- now
      usually said of bearing testimony which is officially
      written down for future use. --Abbott.
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            To depose the yearly rent or valuation of lands.
                                                  --Bacon.
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   5. To put under oath. [Obs.]
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            Depose him in the justice of his cause. --Shak.
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WordNet (r) 3.0 (2006):

depose
    v 1: force to leave (an office) [syn: depose, force out]
    2: make a deposition; declare under oath [syn: swear,
       depose, depone]