Английский словарь американских идиом - lose sight of

{v. phr.} 1. Not to be able to see any longer. * /I lost sight of Mary in the crowd./ * /I watched the plane go higher and higher until I lost sight of it./ Contrast: CATCH SIGHT OF. 2. To forget; overlook. * /Johnny was so interested in the game he lost sight of the time./ * /No matter how rich and famous he became, he never lost sight of the fact that he had been born in the slums./