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Phrase(s): keep one’s fingers crossed (for someone or something) [and] cross one’s fingers
to wish for luck for someone or something, sometimes by actually crossing one’s fingers; to hope for a good outcome for someone or something. • I hope you win the race Saturday. I’m keeping my fingers crossed for you. • I’m trying out for a play. Keep your fingers crossed!
McGrawhill's American Idioms And Phrasal Verbs