it is what it is

The situation, circumstance, or outcome has already happened or been decided or established, so it must be accepted even if it is undesirable. Look, we lost the game, but it is what it is. All we can do is work even harder for the next one. I'm not terribly fond of my daughter's new boyfriend, but it is what it is.

There may have been a problem but it’s time to move on. The precise origin is unknown but the expression has frequently been used in sports to chronicle a loss or other difficulty and indicate it was time to forget it. William Safire found its earliest use in a 1949 Nebraska newspaper article about how pioneer life molded character. “New land is harsh and vigorous and sturdy. . . . It is what it is, without apology” (J. E. Lawrence in Nebraska State Journal, quoted by Safire in the New York Times, March 5, 2006).