cross one's fingers
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.
1b. 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.
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Source: A Dictionary of American Idioms
