Meaning: His heart is making a regular sound like a drum.
Choice of Words: "Beats" means to make a regular sound. "Heart" is the organ that pumps blood through the body. "Drum" is a musical instrument that makes a sound when hit.
Alternative Expressions
The heart is a drummer.
Meaning: This means that your heart is making a rhythmic sound that is similar to the sound of a drum being played.
Choice of Words:Heart is the organ in your body that pumps blood. Is is a verb that means to be or exist. A is an article that means one. Drummer is a person who plays a drum. When you put them together, "The heart is a drummer" means that the heart is like a person who plays a drum.
The heart's beat is a drumbeat.
Meaning: This means that your heart is making a rhythmic sound that is similar to the sound of a drum being played.
Choice of Words:Heart's is the possessive form of the word heart, which means that it belongs to the heart. Beat is the rhythmic sound that the heart makes. Is is a verb that means to be or exist. A is an article that means one. Drumbeat is the rhythmic sound that a drum makes. When you put them together, "The heart's beat is a drumbeat" means that the rhythmic sound that the heart makes is similar to the rhythmic sound that a drum makes.