The term 'PREPARE TO FEATHER' is a job description for a TAR, which is a three-letter word. A TAR is a person who applies hot TAR to the outside of a building or other structure in order to waterproof it. This job requires a great deal of skill and precision, as the TAR must be applied evenly and without any air bubbles. The phrase 'prepare to feather' refers to the process of smoothing out the TAR after it has been applied. This is done by using a special tool called a feather, which is used to spread the TAR evenly and create a smooth finish.