Wiktionary
busy little beaver
n. (context idiomatic English) Someone who has completed or accomplished many tasks or works.
Usage examples of "busy little beaver".
If I were the people whove been reading your material in the netsand a busy little beaver youve been of lateI would start wondering about how much of what I was reading was for real.
If I were the people whove been reading your material in the nets-and a busy little beaver youve been of late-I would start wondering about how much of what I was reading was for real.
According to his demented instruments, someone must have been a busy little beaver down there.