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by heart

   Also found in: Dictionary/thesaurus, Wikipedia 0.12 sec.
by heart
exactly and from memory. You know the telephone number by heart, don't you?
Usage notes: often used with know, learn, recite, and play: I studied piano for two years, and all I learned to play by heart was "Twinkle Twinkle Little Star."
See also: heart

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? References in periodicals archive
The myocyte came from a left ventricle, the most powerful chamber of the heart and the one most afflicted by heart attacks.
The loss in functional ability can occur quickly if the heart is further weakened by heart attacks or the worsening of other conditions that affect heart failure, such as diabetes and coronary heart disease.
Heart failure is a progressive and debilitating disease that stems from heart muscle damage, often caused by heart attacks, valvular disorders or uncontrolled high blood pressure.
 
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