drill down

dɹɪl da͡ʊn


english

1 general:: Phrase(s): drill down (to something) to bore downward to something or some distance. • We drilled down to a layer of waterbearing sand, hoping to make a well. • They had to drill down to bedrock to make a base for the piers that hold the building up.

McGrawhill's American Idioms And Phrasal Verbs


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