learn (something) by heart

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.

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.

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.
See also:
  • learn by heart
  • commit (something) to memory
  • commit to memory
  • learn (something) down pat
  • learn
  • learn a thing or two
  • enquire
  • enquire about (someone or something)
  • bone up
  • bone up on (something)