keep one's fingers crossed, to

keep (one's) fingers crossed

To hope for good luck or that something will happen. The actual gesture, which does not have to accompany the phrase, involves crossing one's middle finger over the index finger as a superstition believed to bring good luck or ward off bad luck. Cross your fingers that this is the package we've been waiting for. OK, I've been crossing my fingers—did you get the job?
See also: crosse, finger, keep
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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!
See also: crosse, finger, keep
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

keep one's fingers crossed, to

To hope for success. This saying comes from an ancient superstition that making the sign of the cross will avert bad luck. Often put as Keep your fingers crossed, meaning “Wish me luck,” it dates from the 1920s. One writer points out it may also have come from children’s games in which crossing one’s fingers denotes that one is “safe,” as well as the gambit of telling a lie with one’s fingers crossed, presumably to avoid punishment for this sinful act.
See also: finger, keep, to
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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