The responsibility for the failure falls squarely 'on her shoulders'. [=she is completely responsible for the failure]
You can never feel confident in this business. You always have to be 'looking over your shoulder'.
He 'has had a chip on his shoulder' ever since he didn't get the promotion he was expecting.
(..) That's a mad-sized if. Our job is "if." What if you were sipping margueritas on a sun-drenched beach turning brown instead of green. Not looking over your shoulder for VERONICA. Don't hate, I helped design VERONICA. As a worst-case measure, right? How about a best-case? What if the world was safe? (..)2015 Avengers: Age of Ultron