English Vocabulary tips & definition with Gymglish.
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the heart: the internal organ in the chest that pumps blood; the root, the essence, the center; the love, the tenderness, the affection
I know the rules by heart. I know the rules by memory, inside-out; I have memorized the rules.
It's important to look at the heart of the matter. It's important that we examine the essence of the matter.
(He suffers from) heart problems: (He suffers from) cardiac problems; medical problems affecting the heart

Pronunciation examples
UK: I lost my heart to a starship trooper.
US: I know the rules by heart.

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