to make someone understand that a particular thing is right or true, or to make someone understand what your attitude is

By taking this action, we are sending a message that bullying will not be tolerated. 通过采取这一行动，我们发出了一个明确的信息：欺凌行为不会被容忍。

Thousands of protesters came here today wanting to send a message. 几千名抗议者赶到这里，为的是发出一个明确的信息。

The magazine sends the wrong message about healthy weight to teenagers. 这份杂志在青少年的健康体重问题上发出了一个错误的信息。