Knock-on-wood Definition
verb
(idiomatic, US) To take a customary action to ward off some misfortune that is believed to be attracted by a presumptuous statement.
Wiktionary
(idiomatic, US) A self-directive to undertake the customary action to ward off bad luck.
I do a lot of walking, and I have never had any knee problems yet, knock on wood.
Wiktionary
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