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.