Definition of hollow noun from the Oxford Advanced American Dictionary

     

    hollow

     noun
    noun
    NAmE//ˈhɑloʊ//
     
     
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  1. 1an area that is lower than the surface around it, especially on the ground muddy hollows The wheelbarrow got stuck in a hollow. The village lay secluded in a hollow of the hills (= a small valley). She noticed the slight hollows under his cheekbones.
  2. 2 a hole or a small space in something The squirrel disappeared into a hollow at the base of the tree.
See the Oxford Advanced Learner's Dictionary entry: hollow