What does «sangrar» mean in Spanish?

Open a vein and let out a certain amount of blood.
To give an outlet to a liquid in whole or in part, opening a conduit through which it flows.
Resin.
To steal, to snatch, to take part of a whole in disguise, to bleed a sack of wheat.
Printing: Start one line further in than the others on the page, as is done with the first line of each paragraph.
Throwing blood.
(sangrarse) To have a bloodletting.
(estar sangrando una cosa) To be dripping blood.
(estar sangrando una cosa) To be clear and patent.
(estar sangrando una cosa) That thing just happened.