Sentence:  The Bangles were a fine all-woman band, starting with a lovely cover of Prince's "Manic Monday." "Walk Like an Egyptian" was cute, and the ladies rocked out an unlikely cover of Simon and Garfunkel's "Hazy Shade of Winter." But they <WSD>jumped the shark</WSD> with the treacly "Eternal Flame," and the end of the road was in sight. 
Meaning of the word marked with <WSD> tags:  To experience a decline in quality, appeal, popularity, etc.