cross one's fingers

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./

Source: A Dictionary of American Idioms

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