Have a/some say in sth: be involved in making a decision about something；have the right or power to influence a decision about something. As in The best thing about working for a smaller company is that it finally feels like everyone has a say in how it should operate.
中文释义：“say”作为名词有发言权；决定权的含义，“have a/some say in sth”是指某人在某事上有发言权，或指某人对某事能说上话, 对决策能起到影响。例句：When he’s 18, he’ll begin to have a/some say in the running of the family business.（当他18岁时，他就开始对家族企业的经营有发言权了。）另外，需要注意的是当我们想要表达在某事上没有或者只有一点发言权时，可以用have no/little say in sth。
今日看点：Have a say in 的同义转换：
1. have a voice in: Citizens want to have a voice in their local government.[c. 1600]
2. have one’s say: As soon as I’ve had my say I’ll sit down. [Late 1600s]
3. have the say: The general has the say over which troops will be sent. [Early 1800s]