Another word for foul-play

But Muratori, reproducing the account given by one of Thomas's friends, gives no hint of foul play.

The king's own legitimate brother Edwin made no attempt on the throne, but in 933 he was drowned at sea under somewhat mysterious circumstances; the later chroniclers ascribe his death to foul play on the part of the king, but this seems more than doubtful.

A still more striking contrast is the passionate outburst of sympathy and indignation with which, in the same diary, he comments on the supposed kidnapping of Luther by foul play on his return from the diet of Worms. Without being one of those who in his city took an avowed part against the old ecclesiastical system, and probably without seeing clearly whither the religious ferment of the time was tending - without, that is, being properly speaking a Reformer - Diirer in his art and his thoughts was the incarnation of those qualities of the German character and conscience which resulted in the Reformation; and, personally, with the fathers of the Reformation he lived in the warmest sympathy.

Rumour attributed his death to foul play.

Basically, it's serious foul play when you're challenging for the ball and violent conduct when the ball isn't there.