Quick definitions from Macmillan ( )

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Quick definitions from WordNet (hollow)

▸ noun:  a small valley between mountains ("He built himself a cabin in a hollow high up in the Appalachians")
▸ noun:  a cavity or space in something ("Hunger had caused the hollows in their cheeks")
▸ noun:  a depression hollowed out of solid matter
▸ verb:  remove the interior of ("Hollow out a tree trunk")
▸ verb:  remove the inner part or the core of
▸ adjective:  as if echoing in a hollow space ("The hollow sound of footsteps in the empty ballroom")
▸ adjective:  not solid; having a space or gap or cavity ("A hollow wall")
▸ adjective:  devoid of significance or point ("A hollow victory")
▸ adjective:  deliberately deceptive ("Hollow (or false) promises")
▸ name:  A surname (very rare: popularity rank in the U.S.: #22964)

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▸ Word origin