drill down

Short definition from Wiktionary

Verb

1. 1
   To examine something on a more detailed level.
2. 2
   To examine information at another level or in greater detail; especially in a database, to navigate to a more detailed level or record.
3. 3
   To replace data with more specific data.
4. 4
   To practice maneuvers in order to memorize them; to drill thoroughly (to practice).
5. 5
   To score points; to do well in a basketball game.

Noun

1. 1
   an internal competition used to practice marching commands, in which the last person caught improperly executing a command wins