Scrabble Dictionary

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Yes, plumb is playable

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TWL06 (NASPA List 2006)

"Plumb" Definition

noun

A weight on the end of a line, used especially by masons and carpenters to establish a true vertical.
A weight on the end of a line, used to determine water depth.
A lead weight attached to a line and used to indicate a vertical direction.

verb-intransitive

To work as a plumber.

verb

To weight with lead.
To measure the depth of with a plumb.
To examine minutely and critically .
To adjust or test by a plumb line.
To seal with lead.

adjective

Exactly vertical. See Synonyms at vertical.
Informal Utter; absolute; sheer: a plumb fool.
Exactly vertical or true.

adverb

In a vertical or perpendicular line.
Informal Directly; squarely: fell plumb in the middle of the puddle.
Informal Utterly; completely: plumb worn out. See Note at right.
Straight down or up .
To a complete degree .