Answer:

plumb

Answer	Crossword Clue
PLUMB	Exactly vertical
PLUMB	Measure the depth of
PLUMB	Perfectly vertical

PLUMB	Downright
PLUMB	Vertical
PLUMB	Vertical determinant
PLUMB	Measure depth, in a way
PLUMB	Lead weight
PLUMB	Eve of "The Brady Bunch"
PLUMB	Absolutely, or absolutely vertical
PLUMB	Carpenter's gadget

PLUMB	Perfectly perpendicular
PLUMB	Perpendicular
PLUMB	Vertical direction indicator
PLUMB	Straight down
PLUMB	Completely, so to speak
PLUMB	Downright, so to speak
PLUMB	Investigate
PLUMB	Take soundings.

PLUMB	Fathom.
PLUMB	Completely: Colloq.
PLUMB	Exactly perpendicular, as a wall.
PLUMB	Fishline sinker.
PLUMB	Vertical.
PLUMB	Entirely: Colloq.
PLUMB	Discover the facts of.
PLUMB	Downright.

PLUMB	Make a depth sounding
PLUMB	Delve deeply
PLUMB	Lead used for sounding
PLUMB	Take a sounding
PLUMB	Fishline sinker
PLUMB	Take soundings
PLUMB	Probe into
PLUMB	Kind of line

PLUMB	Depth checker
PLUMB	Water-depth measurer
PLUMB	Weight that sounds like a fruit
PLUMB	Make vertical
PLUMB	Water depth measurer