Traveling in search of adventure (as in 'knight errant'); also means straying from the proper course or wrong.
From Old French 'errant' meaning 'traveling,' derived from Latin 'errare' meaning 'to wander' or 'to err.' In medieval literature, a knight errant was a wandering warrior seeking quests and adventure.
Don Quixote famously called himself a 'knight errant' and wandered Spain looking for adventures that didn't really exist—the term has come to mean someone pursuing an impossible or misguided quest!
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