knock on wood

knock on wood

A superstitious expression said, typically in combination with actually touching or knocking on a wooden object or surface, when one desires something positive to continue, lest the mention of it "jinx" or somehow reverse one's good fortune. I've been driving for 36 years and have never been in an accident. Knock on wood! Hopefully, knock on wood, we'll continue to avoid sickness this winter.
See also: knock, on, wood
Farlex Dictionary of Idioms.

knock on wood

to rap on something made of wood. (Said as a wish for good luck. Usually a phrase attached to another statement. Sometime said while knocking or rapping on real wood.) I think I am well at last—knock on wood. I knock on wood when I wish something were true.
See also: knock, on, wood
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

knock on wood

Also, touch wood. Express a wish that something will or will not occur, as in This last round of treatment should have cured her, knock on wood. This expression alludes to an ancient superstition that literally knocking on or touching wood will ward off evil spirits. [c. 1900]
See also: knock, on, wood
The American Heritage® Dictionary of Idioms by Christine Ammer.

knock on wood

Avoid misfortune and/or hope for good luck. This magical formula, put as touch wood in Great Britain, is based on the superstition that touching or rapping on anything wooden will avoid a disaster, especially after one has boasted. “Touch wood, it’s sure to come good,” is the proverbial saying. There may have been an ancient religious significance to the gesture, perhaps from the time of the Druids, who regarded certain trees as sacred, but the precise meaning has been forgotten.
See also: knock, on, wood
The Dictionary of Clichés by Christine Ammer
See also:
  • touch wood
  • watch the clock
  • (early) morning dreams come true
  • Morning dreams come true
  • worldly
  • worldly desires
  • earthly
  • earthly desires
  • (one's) jam
  • run (one's) own show