Meaning of “say” - Learner’s Dictionary

say

noun [ U ] uk us /seɪ/

If you have a say in something, you are involved in making a decision about it:

We had some say in how our jobs would develop.
have your say

to give your opinion about something:

We can't vote yet - Christina hasn't had her say.

(Definition of “say noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)