UK—‘a legend in your lifetime’ (1913): allegedly said by Benjamin Jowett to Florence Nightingale—‘a legend in his own lunchtime’ (1969): first recorded in a theatrical review by John Cunningham
UK, 1820—to show willingness to enter into a contest or take up a challenge, especially in business or politics—originally (1804) used in boxing with reference to the custom of throwing a hat into the ring to signal willingness to enter a contest
The adjective ‘living’ is an intensifier, and ‘daylights’ is an 18th-century slang term for ‘eyes’ chiefly used in contexts of physical violence or threats.
first recorded in The Biglow Papers (1848), by American author James Russell Lowell—based on the notion of leaving one’s hat behind in a rush of impetuosity