plumb
/plʌm/ noun C2- A little mass of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction.
- A weight on the end of a long line, used by sailors to determine the depth of water.
- The perpendicular direction or position.
Plural plumbs
From the library
“Plumb in the middle of the back of the head and smack through the brain.
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