The word "haert" appears to be a misspelling of the word "heart." "Heart" is a commonly used word in English and has various meanings depending on the context. It can refer to the organ that pumps blood in the body, or it can be used metaphorically to represent emotions, love, courage, or the center or core of something. Please note that "haert" does not have a distinct meaning in English, and if you encounter it, it is likely an error or a misspelling.