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had plumbed

  • past perfect
    of plumb.
    plumb
    noun
    a small mass of lead or other heavy material, as that suspended by a line and used to measure the depth of water or to ascertain a vertical line.

Example Sentences

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Campaign group Fair Square said Fifa had "plumbed new depths".

From BBC ● Nov. 30, 2024

“Go Dig My Grave” is a song Peat had plumbed for years at casual pub sessions, social hubs that remain central to Irish music tradition.

From New York Times ● Mar. 25, 2023

Relations had plumbed new depths during the previous government’s nine years in power.

From Seattle Times ● Aug. 7, 2022

On Nov. 8, the nation would know which one had plumbed the hopes and fears of America more deeply.

From Time Magazine Archive

As for the school: He alone knew where in Hogwarts he had stowed the Horcrux, because he alone had plumbed the deepest secrets of that place....

From "Harry Potter and the Deathly Hallows" by J.K. Rowling