Free dictionary online: translation in English, Spanish, French, Italian, Chinese, Russian, definitions, synonyms...
Results found in several dictionaries: Collins, Business
speculate 
  vi 
  (=try to guess) spéculer 
to speculate about sth  spéculer sur qch 
  (financially)  spéculer 
to speculate on the stock market  spéculer en Bourse 
She speculated successfully on the stock exchange.   

speculate on the stock market   vi jouer en bourse

Add your entry in the Collaborative Dictionary.

"Collins English French Electronic Dictionary © HarperCollins Publishers 2005"