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)
An unexpected, bizarre, or unwatched source (especially in the phrases out of left field and from left field).
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.
The defensive position in the outfield to the left.
A promise to pay a sum of money in the event that another person fails to fulfill an obligation.
One who undertakes to pay money or perform other acts in the event that his principal fails therein.
A substitute; a hostage.
Evidence; confirmation; warrant.
Certainty.
That which makes sure; that which confirms; ground of confidence or security.