verb (used without object) Australian Slang.
to make or give a speech, especially extensively or elaborately; spiel; orate.
Origin of spruik
First recorded in 1915–20; origin uncertain
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(intr) Australian archaic, slang to speak in public (used esp of a showman or salesman)
Word Origin for spruik
C20: of unknown origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
1916, of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper