Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Origin: Perhaps from bogle; BOGEY

boggle

 verb
     
bog‧gle

the/your mind boggles

also something makes the/your mind boggle also something boggles the/your mind informal if your mind boggles when you think of something, it is difficult for you to imagine or accept it:
The sheer amount of data makes the mind boggle.
the/your mind boggles at
My mind boggles at the amount of work still to do.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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