Definitions of tinker:

• noun:   an itinerant Gypsy
• noun:   a person who enjoys fixing and experimenting with machines and their parts
• noun:   small mackerel found nearly worldwide
• noun:   a traveling repairman who mends broken things (such as metal household utensils)
• verb:   work as a tinker or tinkerer
• verb:   try to fix or mend

  Example: "Can you tinker with the T.V. set--it's not working right"

• verb:   do random, unplanned work or activities or spend time idly
• name:  A surname (rare: 1 in 33333 families; popularity rank in the U.S.: #4523)