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Results found in several dictionaries: Collins, Collaborative Dictionary
zélé, e 
  adj zealous 


excès de zèle 
  nm overzealousness  no pl  
grève du zèle 
  nf work-to-rule  (Grande-Bretagne) , slowdown  (USA)  
zèle 
  nm diligence, assiduousness 
faire du zèle  to be over-zealous 

Collaborative Dictionary     French-English
'zélé' found in translations in English-French dictionary
eager beaver n. la personne zélée Reverso General Dictionary 

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