The phrase "to use a cup" means to hold or drink liquid from a container that has a round shape, a handle, and is usually made of glass, plastic, or ceramic. Full definition
They then use cups of water to fill containers and discuss how this makes it easier to compare the capacities of more than two containers. (tes.com)
When your child reaches new milestones, such as using the cup for the first time, celebrate by letting him or her have a little bit of a favorite food. (abckidsinc.com)
I've never understood why American recipes use cup measurements for EVERYTHING! (ohladycakes.com)