To dry something (transitively) by removing moisture, either naturally or using a device.
洗濯物を外に干して乾かす。
Hang the laundry outside to dry.
濡れた髪をドライヤーで乾かす。
Dry wet hair with a hairdryer.
濡れた本は窓際に置いて乾かすといい。
It's good to put a wet book by the window to dry.