What is the meaning of Drill_down?

To examine something on a more detailed level.

To examine information at another level or in greater detail; especially in a database, to navigate to a more detailed level or record.

To replace data with more specific data.

To practice maneuvers in order to memorize them; to drill thoroughly (to practice).

To score points; to do well in a basketball game.

an internal competition used to practice marching commands, in which the last person caught improperly executing a command wins

Source: wiktionary.org