What does the word embitter mean?

Usage examples for embitter

  1. And now his son's obstinacy must embitter every day of his old age." – The Complete Historical Romances of Georg Ebers by Georg Ebers
  2. It could only embitter his last few hours; and, besides, we had six months to think of it. – Charles O'Malley, The Irish Dragoon, Volume 2 (of 2) by Charles Lever