Definition & Meaning of "[drum] {sth} into {one's} [head]"

What is the origin of the idiom "drum something into someone's head" and when to use it?

The origin of the idiom "drum something into someone's head" can be traced back to the concept of repetitive percussion or rhythmic instruction as a means of instilling knowledge. The metaphorical use of "drumming" suggests a persistent and forceful effort to impress information or skills into someone's consciousness, very much like the rhythmic beating of a drum. In other words, this expression is used to convey the idea of repeated and emphatic teaching to ensure that a particular concept or knowledge is firmly established in the person's mind.