Cross your fingers means: To wish for things to happen the way you want them to.
Example of use: Let's all cross our fingers and hope that our team wins!
Interesting fact about Cross your fingers
The origin of the idiom “cross your fingers” is extremely old and became popular during the earliest days of Christianity. Back then, crossing one's fingers was used both as a plea for divine intervention and as a covert method for identifying oneself as a Christian when in hostile company.
