What is the definition of word knell In Macbeth?

In the play Macbeth by William Shakespeare, the word "knell" is used in the sense of a bell that tolls for a funeral or death, often referred to as a death knell. It suggests a sense of finality, mourning, and the passing of someone. Throughout the play, Shakespeare employs the word knell to create an atmosphere of dread, foreboding, and the tragic events that unfold.