That tempers him to this extremity.
Was it not she and that good man of worship,
Anthony Woodville, her brother there,
That made him send Lord Hastings to the Tower,
From whence this present day he is deliver'd?
We are not safe, Clarence; we are not safe.

GEORGE PLANTAGENET (Duke of Clarence):
By heaven, I think there's no man is secure
But the queen's kindred and night-walking heralds
That trudge betwixt the king and Mistress Shore.
Heard ye not what an humble suppliant
Lord hastings was to her for his delivery?

The meaning of the word tempers is

Question

That tempers him to this extremity.
Was it not she and that good man of worship, 
Anthony Woodville, her brother there, 
That made him send Lord Hastings to the Tower, 
From whence this present day he is deliver'd? 
We are not safe, Clarence; we are not safe.

GEORGE PLANTAGENET (Duke of Clarence): 
By heaven, I think there's no man is secure 
But the queen's kindred and night-walking heralds 
That trudge betwixt the king and Mistress Shore. 
Heard ye not what an humble suppliant 
Lord hastings was to her for his delivery?

The meaning of the word tempers is

sammixboo · Answer

Use context clues :) This can help you a ton! Look at the surrounding verses and words, so you can use these clues from the context to discover the meaning of 'tempers'