Sentence:  A second Norwich goal in four minutes arrived after some dire Newcastle defending. Gosling gave the ball away with a sloppy back-pass, allowing Crofts to curl in a cross that the unmarked Morison powered in with a firm, 12-yard header./ Gosling's plight worsened when he was soon shown a red card for a <WSD>foul</WSD> on Martin. 
Meaning of the word marked with <WSD> tags:  A breach of the rules of a game, especially one involving inappropriate contact with an opposing player in order to gain an advantage; for example, tripping someone up in soccer, or contact of any kind in basketball.