Pronunciation: [ba͡ɪ hˈɑːt] (IPA) 
The phrase "by heart" is often used to describe something that is memorized completely. It is spelled /baɪ hɑrt/ in IPA phonetic transcription. The first part, "by," is pronounced as "baɪ," with a long "i" sound. The second part, "heart," is pronounced as "hɑrt" with a short "a" sound. It is important to learn proper pronunciation and spelling of words to effectively communicate in spoken and written language.
"By heart" is an idiomatic expression that refers to the act of memorization or remembering something perfectly, without the need for any written cues or prompts. When an individual knows or recites something "by heart," it means they have committed the information to memory in such a way that it can be easily recalled, effortlessly and accurately.
Usually used in relation to learning or reciting poems, songs, speeches, or other pieces of literature, knowing something "by heart" implies a deep familiarity and understanding of the content. The phrase suggests that the information is ingrained within a person's mind, allowing them to effortlessly recite it from memory.
When a task or piece of knowledge is learned "by heart," it suggests a level of mastery, as it implies the ability to effortlessly recall and reproduce it. This implies a strong connection between the memorizer and the material, often achieved through repeated practice and rehearsal. Memorizing something "by heart" can be viewed as a mark of respect or dedication, as it demonstrates effort and commitment to truly internalize and understand the material on a profound level.
Overall, "by heart" refers to the state of being able to remember and recite something flawlessly, demonstrating a deep memorization and understanding of the information at hand.
The phrase "by heart" originates from the Middle English word "herte". In Old English, "heorte" referred to the physical organ of the heart, as well as the seat of emotions and intellect. Over time, the word "heorte" evolved into "heart" and its meaning expanded to include memorization or knowledge. Therefore, "by heart" came to mean to know something by memory or to have something memorized.
