noun, plural say-sos.

one's personal statement or assertion.
final authority; directing influence.
an authoritative statement.

Origin of say-so

First recorded in 1630–40; orig., one's mere word on a matter, as opposed to proof Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for say-so


noun informal

an arbitrary assertion
an authoritative decision
the authority to make a final decision
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