To say "eat breakfast" in Engpsh, you can use the phrase "have breakfast" or "eat breakfast." Here are some examples of how you can use these phrases:
"I always have breakfast before I go to work."
"Do you want to eat breakfast with me at the cafe?"
"I'm not really hungry, so I'm going to skip breakfast today."
Note that "breakfast" is a noun that refers to the first meal of the day, usually eaten in the morning. If you want to talk about eating a meal at any other time of day, you can use other words such as "lunch" or "dinner."