plumb (EN)

verb, adverb, noun

verb “plumb”

1. measure how deep a liquid is
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   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”

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

noun “plumb”

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.