Crossword Genius

Turning point in construction? (5)

Ross

I believe the answer is:

screw

(Other definitions for screw that I've seen before include "Prison officer (slang)" , "Propeller (sl.)" , "Fastener with a tapered threaded shank" , "Propeller; fixing pin" , "made tight by driver?" .)

I've seen this clue in The New York Times.
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