learn (something) by heart

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learn (something) by heart

To learn something very thoroughly; to memorize something. Ask Becky to recite the poem—she learned it by heart. You don't have to learn these principles by heart, we just want you to have a basic understanding of them.
See also: by, heart, learn
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

learn something by heart

Fig. to learn something so well that it can be written or recited without thinking; to memorize something. The director told me to learn my speech by heart. I had to go over it many times before I learned it by heart.
See also: by, heart, learn
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

learn by heart

Also, learn by rote. See under by heart.
See also: by, heart, learn
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
"He also learns by heart a large part of God's Book (the Quran), which increases his chances for pardon."
The terrific trio of actors milks endless fun from the business of having to repeat and repeat and repeat the same lines of dialogue, now speeding it up, now just using the first or last words of sentences the audience almost learns by heart.