Knock on wood

Meaning

A superstition involving tapping on a wooden surface to prevent a jinx or to ensure good luck continues. It is the classic way to ward off a curse after boasting.

Superstitious, cautious

Used in a sentence

• I have not been sick all winter, knock on wood.
• The car has run perfectly for years, knock on wood.
• Everything is going according to plan, knock on wood.