From Longman Dictionary of Contemporary Englishsomebody’s say-sosomebody’s say-so informalsomeone’s permission to do something You can’t leave the hospital without the say-so of the doctor. → say-so
Examples from the Corpus
somebody’s say-so• Kathleen evidently ran things around the office and nothing could be done without her say-so.• Nobody here leaves without my say-so.• Tell him he can use the car, but only on my say-so. 