tinning -- (the application of a thin layer of soft solder to the ends of wires before soldering them; "careful tinning of the ends of wires results in a better joint when you solder them")
tinning, tin-plating -- (the application of a protective layer of tin)
Overview of verb tin
The verb tin has 3 senses
tin -- (plate with tin)
can, tin, put up -- (preserve in a can or tin; "tinned foods are not very tasty")
tin -- (prepare (a metal) for soldering or brazing by applying a thin layer of solder to the surface)