IPA: //ˈbiːfsteɪk//
KK: /ˈbifˌsteɪk/
A cut of meat from a cow, typically thick and suitable for cooking by grilling or frying.
I ordered a beefsteak for dinner at the restaurant.
Beefsteak is formed from "beef" (from Old French *boef*, meaning cow meat) and "steak" (from Old Norse *steik*, meaning to roast or fry). The word refers to a slice of meat from a cow that is cooked, typically by roasting or frying.
Think of 'beef' as the meat from a cow and 'steak' as a way to cook it, which helps you remember that 'beefsteak' is a slice of cow meat.