Definition & Meaning of "86"in English

What does "to 86" mean in restaurant slang?

The structure is a simple verb formed from the number 86, whose exact origin is debated but likely comes from old restaurant or bar codes. It is used to describe canceling a customer's order, removing an item from the menu because it's sold out, or refusing service to a difficult patron. People typically say "86 the salmon" when the kitchen runs out, or "86 that guy at the bar" when a customer is cut off.