brighteningгерундий или причастие настоящего времени Used attributively (e.g., "brightening sky"), so needs its own entry.
Определения
Serving to make something brighter or more radiant. The brightening agent restored the fabric's original color.
Becoming brighter, lighter, or more cheerful. She walked on under the brightening sky.
brightenгерундий или причастие настоящего времени Used attributively to describe something that is in the process of becoming brighter or more cheerful.
Определения
Becoming brighter or livelier. A brightening sky greeted the early risers.