to give a handle

from The Collaborative International Dictionary of English v.0.48

Handle \Han"dle\, n. [AS. handle. See {Hand}.]
   1. That part of vessels, instruments, etc., which is held in
      the hand when used or moved, as the haft of a sword, the
      knob of a door, the bail of a kettle, etc.
      [1913 Webster]

   2. That of which use is made; the instrument for effecting a
      purpose; a tool. --South.
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   {To give a handle}, to furnish an occasion or means.
      [1913 Webster]