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Phrase(s): A watched pot never boils.
Prov. Something you are waiting for will not happen while you are concentrating on it. • Don’t just sit there staring at the phone while you wait for Lucy to call. A watched pot never boils. • I’d better do something besides look out the window waiting for Emily to drive up. A watched pot never boils.
McGrawhill's American Idioms And Phrasal Verbs