left field
US /ˌleft ˈfiːld/
UK /ˌleft ˈfiːld/
1.
the part of a baseball field beyond the infield and to the left of a line drawn from home plate through second base
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The batter hit a long fly ball into left field.
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He plays left field for the team.
1.
an unexpected or unusual source or direction
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That idea came completely out of left field.
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His comment was a bit out of left field, but interesting.