The definition of get one’s hopes up is:
(verb) to be enthusiastic about something that is going to happen
I don’t want to get your hopes up, but I think we may have won the lottery!
Shelly got her hopes up when she called the radio station to try and win tickets to see Britney Spears. She was disappointed, however, when she didn’t win.
Mary: Guess what? I found an engagement ring in Trevor’s pocket!
Rebecca: What do you think that means?
Mary: I think he may be going to ask me to marry him!
Rebecca: Don’t go getting your hopes up, are you sure it’s an engagement ring?
Mary: I think so….
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