plumb

About 0.99 uses per million words.

Meaning

noun A little mass of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction.
noun A weight on the end of a long line, used by sailors to determine the depth of water.
noun The perpendicular direction or position.
adjective Truly vertical, as indicated by a plumb line.
adjective Describing an LBW where the batsman is hit on the pads directly in front of their wicket and should be given out.
adverb In a vertical direction; perpendicularly.
adverb Squarely, directly; deeply, completely.
It hit him plumb in the middle of his face.
verb To determine the depth, generally of a liquid; to sound.