To break the heart of

Related to To break the heart of: Broken heart
To bring to despair or hopeless grief; to cause to be utterly cast down by sorrow.
To bring almost to completion; to finish very nearly; - said of anything undertaken; as, he has broken the heart of the task.

See also: Heart, Heart

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.