against air
other.— «He recounted how he’d watch other teams warm up before games, and how those opposing quarterbacks would have problems completing like 70 percent of their passes “against air,” which means in the football vernacular no one defending the receivers.» —“One Last Look At Troy’s, Rayfield’s Big Weekend” by Mickey Spagnola DallasCowboys.com Aug. 6, 2006. (source: Double-Tongued Dictionary)
Further reading
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