Topic: ASTRONOMY
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eclipse2 [transitive]
1HA if the moon eclipses the sun, the sun cannot be seen behind the moon, and if the Earth eclipses the moon, the moon cannot be seen because the Earth is between the sun and the moon
2 [often passive] to become more important, powerful, famous etc than someone or something else, so that they are no longer noticed [↪ overshadow]: 
The economy had eclipsed the environment as an election issue.
The economy had eclipsed the environment as an election issue.
