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Idiomatic expressions,

-pass the buck = avoid responbility
-get to the bottom of the problem = find the real cause of something
-it was the last straw = the last in series irritating events
-got straight to the point = talked about the subject directly
-slipped in my mind = forgot to do something
-ripped of = paid far to much for something
-talking at cross purposes = misunderstanding what someone else is referring to

example sentence :

She was very helpful. She promised to get to the bottom of the problem and find a solution.