What is Eclipse ?
Eclipse is (noun) a time when part of the sun or moon disappears, because either the earth’s shadow passes over the moon, or the moon passes between the earth and the sun There will be a partial eclipse of the moon tonight. (verb) 1. to hide the sun or moon by passing in front of it The sun is eclipsed by the moon. 2. to be more successful than someone She was eclipsed by her younger sister.
source: Easier English, Student Dictionary Upper Intermediate Level