Idiom Definition:
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"to nip it in the bud"  
  to stop something when it is small - before it becomes a big problem
   
Synonyms: 
advanced, anticipate, anticipatory, before, beforehand, early, immediate, preceding, precipitant, prompt, pronto, punctual, quick, seasonable, soon, speedy 
 
 
   
  
    
  
    Literally, this picture shows the bud of a plant.  If we nip the bud (cut off the bud), then the plant will not grow. 
