scratch (verb)  

If you scratch something, you make marks in the surface. A person can scratch with fingernails, or with something sharp like a knife. An animal can scratch with its claws, and a tree or bush with thorns

* The cat has scratched the door. I'll have to repaint it.

** Be careful not to scratch yourself on the roses.

*** Paula scratched her leg climbing over the fence.

**** You scratch my back, and I'll scratch yours (= if you help me, I'll help you)

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