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What you are expecting or wanting to happen is nothing but fantasy. You want to get promoted to general manager? Dream on. You, an opera singer? Dream on.
what you want will not happen â€œI've got a feeling I'll win the lottery this week.â€ â€œDream on!â€
Usage notes: usually said to answer someone else, as in the example.
To fantasize about something that is improbable or unrealistic. Used chiefly as a scornful command: So you want to move to Hollywood and become a movie star? Dream on!