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- DictionaryPlumb/pləm/
verb
- 1. measure (the depth of a body of water): "I plumbed the depth and found the bottom of the shelf to be seven meters down"
- 2. test (an upright surface) to determine the vertical: "they are valuable aids in plumbing the frames and keeping the side of the ship fair"
noun
- 1. a plumb bob.
adverb
- 1. exactly: informal "a bassoonist who sits plumb in the middle of the wind section"
- 2. vertically: archaic "drapery fell from their human forms plumb down"
adjective
- 1. vertical: "ensure that the baseboard is straight and plumb"