defensive circle

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de·fen·sive cir·cle

obsolete term for the addition of a secondary affection that limits or arrests the progress of the primary affection, as is thought to occur when pneumothorax supervenes on pulmonary tuberculosis, the former having a therapeutic effect on the latter.
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Classics tried to push on throughout quarters three and four with some fantastic blocking moves by the defensive circle and excellent interceptions centre court, but Northshore proved the better team on the night as they extended their lead to comfortably win the match.
The defence stood firm but another corner was awarded from a foot in the defensive circle.
Feeley attacks with a big stick and has been effective clearing the ball out of the defensive circle.