Definition from Wiktionary, the free dictionary
- (soccer) The set of defenders in a team.
- it was a comfortable evening for the Gunners back four.
2011 December 10, David Ornstein, “Arsenal 1 - 0 Everton”, BBC Sport:
- Despite dominating possession and territory, they were being comfortably contained by Everton's well-organised midfield and diligent back four.