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What does "knock on wood" mean?
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knock on wood
Definition:
phrase said as a wish for good luck, or to prevent bad luck
Usage:
spoken; often said while knocking on an actual wooden objectSample Dialogue:
A: Did you finish installing the lamp?B: Yes, I connected all the wires. Now I just have to turn it on and see if it works.
A: Well, knock on wood. Let's hope it works.
