Burrowing

Verb

1. Present participle of burrow

Full definition of burrowing

Noun

1. The act or result of making a burrow.
• 1825, Thomas Thomson, ‎Richard Phillips, ‎Edward William Brayley, Annals of PhilosophyThese perforations may be readily distinguished from those more oblique and lateral burrowings which are often found in secondary fossils...