Someone who is hardworking and always very enthusiastic about doing something.
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A person who is keen, hardworking, and very eager to please.
An eager beaver throws themselves at a task and often does more than was asked.
The phrase can be fond or gently teasing.
"Go-getter"
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Someone ambitious and proactive, with more of a leadership or achievement focus
"People-pleaser"
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Someone who does things to gain approval, not necessarily hardworking or enthusiastic
"Eager Beaver"
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Someone so enthusiastic and eager to work that it stands out noticeably