Definition of crystal ball noun from the Oxford Advanced Learner's Dictionary

 

crystal ball

 noun
noun
BrE
 
; NAmE
 
 
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a clear glass ball used by people who claim they can predict what will happen in the future by looking into it Without a crystal ball, it's impossible to say where we'll be next year. I can’t look into my crystal ball and tell you what will happen! I don’t know if it will work—I don’t have a crystal ball.Extra examples I can’t look into my crystal ball and tell you what will happen! I don’t know if it will work—I don’t have a crystal ball.
See the Oxford Advanced American Dictionary entry: crystal ball