By heart

//baɪ ˈhɑːt// prep_phrase

Definitions

Adverb
  1. 1
    by committing to memory wordnet
Prep_phrase
  1. 1
    From unaided memory and in full detail.

    "to learn something by heart"

Etymology

From Middle English by herte. Compare French par cœur (literally “by heart”), of which the English may be a calque.

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