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by heart

by heart

35 2.5
From memory without looking at notes
  • idiom
translation icon : de memoria
  • Bet you know it off by heart, do you?
  • learn by heart
  • know by heart

I knew old music by heart and could say the whole text by heart.

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Examples

Synonyms

by memory
vsby heart
1 3.3

Using what you remember without reading or looking

is learned so one can say it without looking at text

How Memorized

by heart
35 2.5
by memory
1 3.3

Surface Forms

by heart positive

Morphology

by + heart

The meaning 'from memory' is not compositionally derived from the literal senses of 'by' and 'heart' — 'heart' primarily denotes the organ or centre and does not transparently signal memorization. This is an idiomatic metaphorical extension (learned usage) rather than a predictable combination, so a B1 learner who only knows the constituent words would unlikely infer the meaning.

Etymology

By heart may come from the old idea that the heart held people’s memory, not the head. One popular story says learning something so well made it feel like it was inside your heart, not on a page, so by heart means 'from memory'.