Idiom: "(to) set the record straight"
Definition:
to correct an inaccurate account
Examples:
1) President Clinton hoped to set the record straight in his new book.
2) Let me set the record straight. I was the one who got an A on the test.
中文解释: http://www.youzienglish.com/main/idiom_of_the_day/to_set_the_record_straight/cn/