Longman Dictionary of Contemporary English homepage

Topic: CARDS

joker

 noun
     
jok‧er [countable]
1 informal someone who behaves in a way you think is stupid:
Look at that joker - he's doing 25 miles an hour at the most.
2DGC a playing card that has no fixed value and is only used in some card games
3 someone who makes a lot of jokes
4

the joker in the pack

something or someone whose effect on future events cannot be known
Definition of joker from the Longman Dictionary of Contemporary English within
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