The Collaborative International Dictionary of English v.0.48:

Lop \Lop\ (l[o^]p), v. t. [imp. & p. p. Lopped; p. pr. & vb.
   n. Lopping.] [Prov. G. luppen, lubben, to cut, geld, or OD.
   luppen, D. lubben.]
   1. To cut off as the top or extreme part of anything; to
      shorten by cutting off the extremities; to cut off, or
      remove, as superfluous parts; as, to lop a tree or its
      branches. "With branches lopped, in wood or mountain
      felled." --Milton.
      [1913 Webster]

            Expunge the whole, or lop the excrescent parts.
                                                  --Pope.
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   2. To cut partly off and bend down; as, to lop bushes in a
      hedge.
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The Collaborative International Dictionary of English v.0.48:

Lopping \Lop"ping\, n.
   A cutting off, as of branches; that which is cut off;
   leavings.
   [1913 Webster]

         The loppings made from that stock whilst it stood.
                                                  --Burke.
   [1913 Webster]