The phrase "tuna fish" refers to a type of fish called tuna. It is commonly used to describe a specific species of fish that is often caught and eaten by people. Full definition
I hope that you will dig the rest of it out of the garage and begin to use it frequently, even if just for tuna fish sandwiches or peanut butter and jam sandwiches. (lovelandlodge.com)
Serve in a bowl with quarters of hard boiled eggs, chunks of tuna fish and black olives. (fieryfoodscentral.com)
Of course, once they graduated college, they quickly learned that being Real Adults meant making very little money, not living together, and eating crackers with tuna fish for dinner. (bonappetit.com)