The Collaborative International Dictionary of English v.0.48:

Skinch \Skinch\, v. t. & i. [imp. & p. p. Skinched; p. pr. &
   vb. n. Skinching.] [Cf. Scant.]
   To give scant measure; to squeeze or pinch in order to effect
   a saving. [Prev. Eng. & Colloq. U.S.]
   [1913 Webster]