Sentence:  The <WSD>trouble</WSD> was a leaking brake line.   The <WSD>trouble</WSD> with that suggestion is that we lack the funds to put it in motion.   The bridge column magnified the <WSD>trouble</WSD> with a slight tilt in the wrong direction. 
Meaning of the word marked with <WSD> tags:  A difficulty, problem, condition, or action contributing to such a situation.