Английский словарь американских идиом - cross one's fingers

{v. phr.} 1a. To cross two fingers of one hand for good luck. * /Mary crossed her fingers during the race so that Tom would win./ 11b. or keep one's fingers crossed {informal} To wish for good luck. * /Keep your fingers crossed while I take the test./ 2. To cross two fingers of one hand to excuse an untruth that you are telling. * /Johnny crossed his fingers when he told his mother the lie./