noun

1. A little mass of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction.

2. A weight on the end of a long line, used by sailors to determine the depth of water.

3. The perpendicular direction or position.

Synonyms: plumb bob, plumb line, plummet

verb

1. To determine the depth, generally of a liquid; to sound.

2. To attach to a water supply and drain.

3. To think about or explore in depth, to get to the bottom of, especially to plumb the depths of.

adjective

1. Truly vertical, as indicated by a plumb line.

2. Describing an LBW where the batsman is hit on the pads directly in front of his wicket and should be given out.

Synonyms: perpendicular

adverb

1. In a vertical direction; perpendicularly.

2. Squarely, directly; completely.

   “It hit him plumb in the middle of his face.”