left field

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left field (countable and uncountable, plural left fields)

1. (baseball) The part of a baseball field which is beyond the infield and to the left of a person standing on home plate and facing the pitcher.
   • 2004 May 10, The New Yorker:

     The double, by pinch-hitter Ruben Sierra, curved sharply toward foul ground in deep left field but then changed its mind and hit the line instead—a big hit, and a smile at last from the great and enigmatically difficult game.

2. (baseball) The defensive position in the outfield to the left.
3. (figurative) An unexpected, bizarre, or unwatched source (especially in the phrases out of left field and from left field).

   Some of her comments really came from left field. I have no idea what she was thinking.

   • 2004 September 23, London Review of Books:

     There is no serendipity without a flash of insight from left field, an oblique eureka effect.

4. (figurative) An unusual or unexpected position, or a viewpoint held by very few others in contrast to the majority viewpoint (especially in the phrases out in left field and way out in left field)
   • 1960, Journal of business education‎, volume 35, page 303:

     Tonne is way out in left field if he thinks a voice writing machine will never be built or that there are no existing prototypes or work being done in this […]

• leftfield (adjective)