Knock on wood

Meaning

Perform a gesture to prevent bad luck after speaking positively.

Usage

Used when someone wants to avoid tempting fate.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

A superstition for warding off bad luck. Stories about spirits living in trees are popular but unproven.

Recorded in English from the 19th century.