The phrase "to call for" means to request, ask or propose something. It can be used in various contexts such as making a demand, ordering something, suggesting an action or expressing a need. For example, if someone is ill and needs medical attention, one might say that they are calling for help. Similarly, when making a presentation, the speaker may call for questions from the audience at the end of their talk. In summary, "to call for" means to ask for something, whether it be an action or object, through verbal or written communication.