plumb1

verb

• 1measure (the depth of a body of water).
• [no object] (of water) be of a specified depth:at its deepest, the lake scarcely plumbed seven feet
• explore or experience fully or to extremes:she had plumbed the depths of depravity

• 2test (an upright surface) to determine the vertical.

noun

• a plumb bob.

adverb

• 1 informal exactly:a bassoonist who sits plumb in the middle of the wind section
• [as submodifier] North American to a very high degree; extremely:they must both be plumb crazy

• 2 archaic vertically:drapery fell from their human forms plumb down

adjective

• vertical:ensure that the baseboard is straight and plumb