A call or appeal to people — e.g., a request for support, participation, or attention (used for announcements, fundraising appeals, etc.).
市長の呼びかけで募金が集まった。
Donations were gathered following the mayor's appeal.
先生の呼びかけに学生たちが応じた。
The students responded to the teacher's call.
SNSでの呼びかけが話題になった。
A call posted on social media became a topic of discussion.