Feathering a light source means to deliberately misdirect that light source so that the edge of the beam of light illuminates the subject. Quite often this is done to correct hot-spots of light. It can be done with medium to close-up shots of a single subject (feathering the main or key light) or can be done with a large group in an open room (feathering two lights so that the both focus past, or even over, the group) -- the result being that the edge of the light is spread more evenly across the group. If you are shooting a group of individuals using external lights (monolights or flashes) and you find that the center of the group is much "hotter" or brighter than the edges of the group, try feathering the light source.
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