To let blood

See under Let.
- Shak.
to cause blood to flow; to bleed.

See also: Blood, Let

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
Thus it was, not with one or two, or ten or twenty, but with the greatest part of them; and, if I remember right, our surgeon was obliged to let blood of about thirty persons.
Ideally the valves work in sync, with the mitral and tricuspid valves opening to let blood flow from the atria (the hearts upper chambers) into the ventricles (the heart's lower chambers), and then closing once the ventricles have filled.
Your brain registers this information and tells your heart to beat as fast as if you were running, urging it to let blood surge through your veins and the tiniest of blood vessels, just to bring your body back to normal temperature.
The aortic valve opens to let blood flow from the heart to the aorta, your largest artery and the one that sends blood to most of the body.
Veins contain one-way valves that open to let blood flow through and then shut to keep blood from flowing backward.
It is made up of four flaps which open to let blood pass and then snap shut again to stop any blood leaking back into the heart.
In a healthy vein, blood flows to the heart smoothly and is prevented from flowing backwards by tiny valves that open and close to let blood through.
With each heartbeat, the aortic valve opens (to let blood out) and closes to enable the left ventricle to fill with fresh oxygenated blood from the lungs.
NO NEW HIROSHIMAS Lord in deep and silent prayer I kneel here to pray That we shall not forget to let Blood red leaf of Japanese maple find grief Of ageing foliage crimson purple From days of Hiroshima.
In early modern England, too, blood's referential range extended beyond the medical: for about twenty years during the Commonwealth and early Restoration, an intense but short-lived debate arose about phlebotomy, the ancient and venerable art of incising veins to let blood from particular parts of the body.
Victims do not have to let blood in order to satisfy the desire for revenge.
To this splendid elucidation, a sanctoral is added, together with advice on the husbandry required by men, animals, and plants during each of the months, followed by a summary of the effects of each sign of the zodiac on the human body and instructions on how to let blood. The translation of the Lunari follows this essential scientific information, and ends with a table for converting the data of the Lunario (which was correct for Barcelona) to apply to a series of Italian cities.