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You say it when you say something you dont want to happen, for luck almost. For example...."Ive never broken a bone" "Knock on wood". Its a superstition that if you knock on wood after saying it that it wont happen.
They're the same, probably exported to the US via people in wooden ships. The US version crops up in old songs and B&W musicals as well. The standard joke was to hit your head as you said it...
It is for luck. If you have said something that could have jinxed you you say touch wood or knock on wood and find wood :)
one of my teachers said it to scare of all the evil spirts out from the trees, cuz thats what they knocked on...trees
That is how I call it. I've never actually heard of "Knock on wood before" but they probably mean the same thing.
We call it touch wood, British English maybe? =)
oohhh alright thank you