a large semiaquatic broad-tailed rodent native to North America and northern Eurasia. It is noted for its habit of gnawing through trees to fell them in order to make dams

a very hard-working person

Hopkins was a regular beaver where gardening was concerned

a boy aged about 6 or 7 who is an affiliated member of the Scout Association

work hard

Bridget beavered away to keep things running smoothly