BY HEART


Meaning of BY HEART in English

( BrE also off by ˈheart )

using only your memory :

I've dialled the number so many times I know it by heart.

She's learnt the whole speech off by heart.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.