knock on wood Meaning in the Cambridge English Dictionary
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Meaning of “knock on wood” in the English Dictionary

"knock on wood" in British English

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knock on wood

US (UK touch wood) informal said in ​order to ​avoidbadluck, either when you ​mention good ​luck that you have had in the past or when you ​mentionhopes you have for the ​future: The ​deal will be ​agreed on ​Wednesday, knock on ​wood.
(Definition of knock on wood from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"knock on wood" in American English

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knock on wood

I ​hope my good ​luck will ​continue: I never have ​trouble with my ​car, knock on ​wood. Note: Used when you think there could be difficulties.
(Definition of knock on wood from the Cambridge Academic Content Dictionary © Cambridge University Press)
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