Few writers have plumbed a region's dark history so thoroughly or profoundly.
And now that he had had his way and plumbed the depths of her emotions and desires he had a higher estimate of her personality.
The same would be true of the passage if we plumbed the middle.
The Laird of Tyee had thought he had long since plumbed the heights and depths of the joys and sorrows of fatherhood.
With this consummation in view, he plumbed every depth of human nature.
Aunt Maria often talked as if she had plumbed the greatest depths to which human nature can sink.
He plumbed his brain for a story to tell them or a little play to act out.
I think that I plumbed the depths between sixteen and a half and twenty-two.
She had not as yet plumbed the depths of his social ignorance.
He felt that "it" had plumbed the minds of all on board and chosen him to take over and lead the others.
"lead hung on a string to show the vertical line," early 14c., from Old French *plombe, plomee "sounding lead," and directly from Late Latin *plumba, originally plural of Latin plumbum "lead (the metal), lead ball; pipe; pencil," a word of unknown origin, related to Greek molybdos "lead" (dialectal bolimos) and perhaps from an extinct Mediterranean language, perhaps Iberian.
"perpendicular, vertical," mid-15c., from plumb (n.). The notion of "exact measurement" led to extended sense of "completely, downright" (1748), sometimes spelled plump, plum, or plunk.
Completely; entirely; stone: What he said was plumb silly
[1748+; fr notions of exact extent and precision associated with the plumb bob or sailor's plumb line (for measuring depth of water), ultimately fr Latin plumbum, ''lead'']