What does the word exert mean?

Usage examples for exert

  1. Never at any time did I know him exert so successfully his charm of public manner. – John Redmond's Last Years by Stephen Gwynn
  2. And Audrey puzzled her head once again to discover why the Foas should exert such influence upon the fate of music in Paris. – The Lion's Share by E. Arnold Bennett
  3. These waters must be troubled, before they can exert their virtues. – The Works of the Right Honourable Edmund Burke, Vol. I. (of 12) by Edmund Burke