knife up
verb- To trim the edges on a boot or shoe of bits of leather, etc. that may be attached to the sides.
- To trim with a knife.
- To extract a morsel or dab (of something) with a knife.
- To cut up or carve up with a knife.
- To slice through; to cut or traverse a path through or between.
- To penetrate sharply upward.
- To move in a stabbing or penetrating manner
- To traverse up the body in a quick stabbing sensation
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