To tinker means to make small adjustments or repairs to something, often by experimenting playfully rather than following a formal plan. When you tinker with a broken radio, you might take it apart, try reconnecting wires in different ways, and test various fixes to see what works. When someone tinkers with a recipe, they adjust the ingredients bit by bit until it tastes just right.

The word suggests a hands-on, curious approach. A tinkerer is someone who enjoys figuring out how things work by taking them apart and putting them back together. Thomas Edison was a famous tinkerer who experimented with thousands of materials before finding the right filament for his light bulb. The Wright brothers tinkered endlessly with wing designs and engine adjustments before achieving powered flight.

Tinkering isn't the same as careful, methodical engineering or following instructions step by step. It's more exploratory and experimental, trying this and that to see what happens. You might tinker with your bike's gears, tinker with code in a computer program, or tinker with the arrangement of furniture in your room. Some of humanity's greatest inventions started with someone who loved to tinker.