Definition of "Tinker" :

noun: small mackerel found nearly worldwide

noun: formerly a person (traditionally a Gypsy) who traveled from place to place mending pots and kettles and other metal utensils as a way to earn a living

noun: a person who enjoys fixing and experimenting with machines and their parts

verb: try to fix or mend

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

verb: do random, unplanned work or activities or spend time idly

verb: work as a tinker or tinkerer