What's "show up" mean and is it different from just saying "show?"

Native speaker’s answer
Rebecca
"Show up" is different from "show!" "Show up" is a phrasal verb that means to arrive somewhere to join a group of people or for an event or gathering. Usually unexpectedly or quite late. "Show" means to allow or cause something to be visible or a stage performance. Ex: Our dinner guests didn't show up last night. So after an hour we just ate the food ourselves. Ex: Josh showed up to watch our dance rehearsals. => unexpected Ex: We went to the eight o'clock show. The performance was magnificent.