Verb
To wound one's opponent in such a way that they bleed.
to draw first blood
(figuratively) To have an injurious effect; to strike home, as a barb or insult.
Source: en.wiktionary.orgThe capitalist has no heart, but harpoon him in the pocketbook and you will draw blood. Bill Haywood
I tell students they will know they are getting somewhere when a scene is so painful they can just barely bring themselves to write about it. A writer has to draw blood. Robert Morgan
Dissent, is like a Gurkha's ‘khukri', once it emerges form its sheath it must draw blood before it can be put away again. Shashi Tharoor
I went to school for about 2 years on a technical course, and I learned a lot. I learned about air mixture ratios and all the stuff; I learned how to draw blood. Tom Araya
You cannot draw blood from a turnip. Italian Proverb
One cannot draw blood from a turnip. Irish Proverb