know (something) by heart

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know (something) by heart

To have learned or memorized something completely. Ask Becky to recite the poem—she knows it by heart. I can't sing that song in front of an audience if I don't know the words by heart!
See also: by, heart, know

know something by heart

Fig. to know something perfectly; to have memorized something perfectly. I know my speech by heart. I went over and over it until I knew it by heart.
See also: by, heart, know
References in periodicals archive ?
The child is already eating solids: carrots, raw turnips and parsnips - true to his Protestant genes he is only keen on traditional roots - and he already knows by heart most of the Bible and the names of the Rangers teams who won the Scottish Premiership during the '90s.
John McBlain COLUMN: Where there's a Will there's a way; The Sunday Mirror columnist who tells us what's happening in Norn Iron: KING BILLY CLONED
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