Definition of drill down phrasal verb from the Oxford Advanced Learner's Dictionary

 

drill down

 phrasal verb
phrasal verb
 
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Phrasal Verbs
(computing or business) to go to deeper levels of an organized set of data in order to find more detail, especially on a computer or a website Navigation is good and there's a display to show how far you've drilled down.
See the Oxford Advanced American Dictionary entry: drill down