The phrase "blade runner" refers to someone who hunts down and captures artificial beings called replicants, who look like humans. It comes from the title of a science fiction film called "Blade Runner." Full definition
In order to answer the questions that have arisen due to this discovery, the persistent blade runner decides to go against the orders given to him. (cinematicessential.com)
We may find out for sure as Ryan Gosling joins the cast as LAPD Officer K, a new blade runner who meets up with the former cop in a future LA where, Villeneuve says, «the climate has gone berserk — the ocean, the rain, the snow is all toxic.» (rollingstone.com)
This choice and his effort lead him into a world of new sorts of danger as he begins a quest that requires him to locate Rick Deckard (Harrison Ford), a former blade runner who disappeared thirty years earlier. (cinematicessential.com)