heart's blood

Noun

heart-blood (uncountable)

1. (archaic, literary) Blood needed for continued life; blood regarded as the seat of life; lifeblood.
   • […] I am not your king / Till I be crown’d and that my sword be stain’d / With heart-blood of the house of Lancaster; […]1591 (date written), William Shakespeare, “The Second Part of Henry the Sixt, […]”, in Mr. William Shakespeares Comedies, Histories, & Tragedies. […] (First Folio), London: […] Isaac Iaggard, and...