beaver
noun
a large, amphibious rodent of the genus Castor, having sharp incisors, webbed hind feet, and a flattened tail, noted for its ability to dam streams with trees, branches, etc.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
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Meanwhile, never one to miss a chance of some free publicity, PRs across the land have been beavering away for weeks on their April fool press releases in the hope of a few column inches.
From The Guardian ● Apr. 1, 2017