Idiom of the Day two idioms have very similar meanings. To “cross your fingers” or to “knock on wood” is to ask for favor, luck, protection, blessings, or a small wish to come true. We may say, “Well, today is my interview day - cross my fingers I get the job.” Or, “Everyone at work is sick except me. Let’s hope I stay healthy - knock on wood.” In both cases, you are hoping that God, nature, fate, etc. will reward you.
“Cross your fingers” &
“Knock on wood”
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