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plumb (EN)
verb, adverb, noun

verb “plumb”

Infinitiv plumb; hien plumbs; Verg. plumbed; Part. Verg. plumbed; Ger. plumbing
  1. measure how deep a liquid is
    Before diving into the lake, she plumbed it to ensure it was safe.
  2. deeply explore or investigate something
    To truly understand his character, the author spent months plumbing his protagonist's past.
  3. connect to a water system and sewage
    Before moving in, we had to plumb the new sink to ensure it had running water and proper drainage.

adverb “plumb”

plumb (more/most)
  1. (informal) exactly
    She fell plumb into the pool with a loud splash.

noun “plumb”

Singular plumb, Plural plumbs
  1. a weight used to show a straight up-and-down line
    To ensure the wall was perfectly vertical, the construction worker hung a plumb from the top edge.