PLUMB
Definition of PLUMB
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A little mass of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction.
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A weight on the end of a long line, used by sailors to determine the depth of water.
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The perpendicular direction or position.
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To determine the depth, generally of a liquid; to sound.
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To attach to a water supply and drain.
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To think about or explore in depth, to get to the bottom of, especially to plumb the depths of.
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Truly vertical, as indicated by a plumb line.
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Describing an LBW where the batsman is hit on the pads directly in front of his wicket and should be given out.
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In a vertical direction; perpendicularly.
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Squarely, directly; completely.
"It hit him plumb in the middle of his face."
Source: Wiktionary