The phrase "to speak to" means to communicate with someone using spoken language. It can refer to having a conversation or discussing something with another person, either in person or through a communication device such as a phone or computer.
Usage examples
I'd like to speak to the manager about the issue I had with the product.
I need to speak to a doctor about my symptoms and get an appointment.
He wants to speak to a lawyer for legal advice on his case.
I would like to speak to someone from customer service to resolve my billing issue.
The teacher needs to speak to the parents about the student's academic performance.
It is important to speak to the team members individually to address any concerns or questions.