Sentence:  The Black Cats contributed to their own downfall for the only goal when Titus Bramble, making his first appearance since Boxing Day, and Michael Turner, let Phil Jones' cross <WSD>bounce</WSD> across the six-yard box as Rooney tucked in at the back post. 
Meaning of the word marked with <WSD> tags:  To move quickly up and then down, or vice versa, once or repeatedly.