noun
a weight on a string used to determine verticality or depth
verb
to measure the depth of something or to install something in a straight or vertical position
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The plumber used a plumb line to ensure the new pipe was perfectly straight.
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I need to call a plumber to fix the leak under my sink, it's beyond my plumb skills.
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I heard that new rapper's lyrics are so plumb, they're fire!
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She had to plumb the depths of her emotions to find the strength to forgive him.