In cricket, a batsman retires out if he retires without the umpire's permission, and does not have the permission of the opposing captain to resume his innings. This occasionally happens in friendly or practice matches, for instance English county sides versus University Centres of Cricketing Excellence.
Only two batsmen have retired out in Test match cricket. Both instances occurred in the same match, where the Sri Lankan batsmen Marvan Atapattu and Mahela Jayawardene both retired out. Each of these two batsmen had already scored more runs than the entire Bangladeshi team in the previous innings, and it is arguable that they deliberately gave batting time to newer teammates. [1]