A cog is a small, wheel-like object with teeth that fits into a larger machine. It helps the machine work by connecting with other cogs and turning to make things move. Full definition
With so much torque, part of the joy is to feel the performance build in a gear, but the constant shuffling of cogs in auto blunts that feeling and interrupts the acceleration, albeit briefly. (evo.co.uk)
Like a compact series of cogs in an unimaginably large machine, vast cyclones also swirl around the north and south poles, clocking wind speeds of over 220 miles per hour (350 kilometers per hour)-- wind speeds that are the equivalent of a terrestrial Category 5 hurricane. (science.howstuffworks.com)
With others you head to Settings > Apps and then hit the settings cog icon in the top corner where you'll then options to change default apps. (pocket-lint.com)