Crossword Genius

Completely vertical (5)

Ross

I believe the answer is:

plumb

I believe this is a double definition.

'completely' is the first definition.
(synonyms)

'vertical' is the second definition.
(similar in meaning)

(Other definitions for plumb that I've seen before include "Connect pipes" , "True" , "Fathom - out-and-out" , "Test alignment" , "Precisely" .)

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