This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Football The players stationed behind the line of scrimmage.

n. Football The positions filled by these players.

n. Football The area in which these players line up.

n. Sports The primarily defensive players on a soccer, field hockey, or Rugby team.

n. The area of play behind either the offensive or defensive line.

n. The players positioned in this area.

n. the offensive football players who line up behind the linemen

"The backfield is big enough for Portis and Torain, Portis said."

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counterair    lineman    quarterbacks    fishing rod    middle distance