Definitions of fumble:

• noun:   (sports) dropping the ball
• verb:   make one's way clumsily or blindly

  Example: "He fumbled towards the door"

• verb:   drop or juggle or fail to play cleanly a grounder

  Example: "Fumble a grounder"

• verb:   handle clumsily
• verb:   feel about uncertainly or blindly
• verb:   make a mess of, destroy or ruin