eclipsinggerund / present participle Used attributively to describe phenomena connected with an eclipse or something that surpasses/overshadows another.
Definitions
Producing or occurring during an eclipse; relating to the obscuration of a celestial body. The astronomers photographed the eclipsing shadow as it crept across the lunar surface.
Surpassing or overshadowing something else in importance, fame, or quality. His eclipsing success left his former rivals far behind.