Knock on wood

//ˌnɒk ɒn ˈwʊd// intj, verb

Definitions

Intj
  1. 1
    Hopefully; a self-directive to undertake the customary action to ward off bad luck. Philippines, US, idiomatic

    "I do a lot of walking, and I have never had any knee problems yet, knock on wood."

Verb
  1. 1
    To take a customary action to ward off some misfortune that is believed to be attracted by a presumptuous statement. Philippines, US, idiomatic

Etymology

Etymology 1

From a folk practice of unclear origin.

Etymology 2

From a folk practice of unclear origin.

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