Hollowing

from The Collaborative International Dictionary of English v.0.48

Hollow \Hol"low\, v. t. [imp. & p. p. {Hollowed}; p. pr. & vb.
   n. {Hollowing}.]
   To make hollow, as by digging, cutting, or engraving; to
   excavate. "Trees rudely hollowed." --Dryden.
   [1913 Webster]