The Collaborative International Dictionary of English v.0.48:

Bottom \Bot"tom\, v. t. [imp. & p. p. Bottomed (?); p. pr. &
   vb. n. Bottoming.]
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   1. To found or build upon; to fix upon as a support; --
      followed by on or upon.
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            Action is supposed to be bottomed upon principle.
                                                  --Atterbury.
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            Those false and deceiving grounds upon which many
            bottom their eternal state].          --South.
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   2. To furnish with a bottom; as, to bottom a chair.
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   3. To reach or get to the bottom of. --Smiles.
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