stropping

from The Collaborative International Dictionary of English v.0.48

Strop \Strop\, v. t. [imp. & p. p. {Stropped}; p. pr. & vb. n.
   {Stropping}.]
   To draw over, or rub upon, a strop with a view to sharpen;
   as, to strop a razor.
   [1913 Webster]