This will allow more blood to flow to your brain.
There was only a pinpoint opening to allow blood to flow.
Those veins were different from the others - they did not allow blood to flow up, but only down.
Administrative mistakes can also allow bad blood to find its way into medical use.
Keep the person's face elevated to allow blood to drain.
The captain was not about to allow additional blood to stain his hands.
I will not allow blood to be shed, not even by you, my friend from the West.
One day, he allows blood to be drawn for the first time in years.
It also allows menstrual blood to leave a woman's body.
They do allow such blood to be used for research.