Crossword Genius

Period of high economic growth (4)

Ross

I believe the answer is:

boom

(Other definitions for boom that I've seen before include "Spar - loud noise" , "Prosperous time -- rumbling sound" , "Prosperous time - sound of explosion - yachting spar" , "become suddenly prosperous" , "Period of prosperity or sonic sound" .)

I've seen this clue in the Sydney Morning Herald.
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