knock on wood
interjection//ˌnɑk ɑn ˈwʊd//peppar, peppar, ta i trä, peppar peppar
(idiomatic, US, Philippines) Hopefully; a self-directive to undertake the customary action to ward off bad luck.
(idiomatic, US, Philippines) To take a customary action to ward off some misfortune that is believed to be attracted by a presumptuous statement.