Football. an offensive formation in which the wingback lines up outside of and about one yard behind an end, the quarterback lines up lateral to the wingback but about midway between the same end and the center, the fullback is three or four yards behind the middle of the line, and the tailback lines up one yard behind the fullback on the other side of the line from the wingback and quarterback. Also called sin'gle wing'. Cf. double wingback formation.