eager beaver
📖 Definitions
noun
One who is enthusiastic and hard-working, sometimes to the point of being overzealous.
💬 Usage Examples
“He was surprised when he met the head of security in the lobby and learned that the building was not as empty as he had anticipated. One eager beaver, as the man put it, was still plugging away on the sixth floor at almost nine o’clock at night. That eager beaver was Serena Van Buren.” Judy Angelo; Tamed by the Billionaire; Phoenix Publishing; 2016.