puzzle - definition and synonyms

 
verb [transitive] 

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/ˈpʌz(ə)l/
present tense
I/you/we/theypuzzle
he/she/itpuzzles
present participlepuzzling
past tensepuzzled
past participlepuzzled
  1. to make someone worry and think hard, by being difficult to understand

    His behaviour that night puzzled me for a long time.