to dig a tunnel or hole
(with adverbial of direction) to move underneath or press up against in search of safety or comfort
(with into) to investigate thoroughly
A tunnel or hole, often as dug by a small creature.
A heap or heaps of rubbish or refuse.
To perforate with a trephine.
To use a trephine during surgery.
A surgical instrument with a cylindrical blade used to remove a circular section of tissue, f.e. bone or cornea; a trepan.