the piece of ground in the outfield on the catcher's left
"the batter flied out to left"
the fielding position of the player on a baseball team who is expected to field balls in the left third of the outfield (looking from home plate)
"The coach shouted at the shortstop for throwing wildly after failing to catch the fly ball while playing leftfield."
From out of left field; off-the-wall; unconventional.
"The suggestion to solve the budget crisis by launching a rocket-powered kite felt like it came straight from out of left field, leaving everyone confused and skeptical."