(gen.) this comes from an old superstition that if you cross your fingers you'll be lucky.
Example: "I don't know what they'll give me for Christmas, but fingers crossed, it'll be a trip to Lesotho."
In the news: timesofindia.indiatimes.com
Dictionary: crossed fingers
Previous quiz: week-150310
Link to this idiom:
fingers crossed, english idioms, english expressions, esl