If something is hollow, it is empty on the inside. A chocolate Easter bunny looks like so much chocolate until you realize that it is hollow and quickly eaten.

The idea of emptiness is apparent in the other uses for hollow too. A valley between mountains is called a hollow and if you're really thin, you may have hollow cheeks. Things like words and promises are hollow if the person uttering them does not intend to keep them. And a hollow victory is not very satisfying, as it means that you have reached your goal, but lost something more important along the way.

Definitions of hollow
  1. adjective
    not solid; having a space or gap or cavity
    “a hollow wall”
    “a hollow tree”
    hollow cheeks”
    “his face became gaunter and more hollow with each year”
    holding or containing nothing
    being or suggesting a cavern
    deep-set, recessed, sunken
    having a sunken area
    fistular, fistulate, fistulous
    hollow and tube-shaped like a reed
    cannular, tube-shaped, tubelike, tubular, vasiform
    constituting a tube; having hollow tubes (as for the passage of fluids)
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    entirely of one substance with no holes inside
    being the same substance throughout
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  2. adjective
    as if echoing in a hollow space
    “the hollow sound of footsteps in the empty ballroom”
    having a tendency to reverberate or be repeatedly reflected
  3. adjective
    devoid of significance or point
    “a hollow victory”
    synonyms: empty, vacuous
    meaningless, nonmeaningful
    having no meaning or direction or purpose
  4. noun
    a cavity or space in something
    “hunger had caused the hollows in their cheeks”
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    type of:
    cavity, enclosed space
    space that is surrounded by something
  5. noun
    a depression hollowed out of solid matter
    synonyms: hole
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    burrow, tunnel
    a hole made by an animal, usually for shelter
    gopher hole
    a hole in the ground made by gophers
    kettle, kettle hole
    (geology) a hollow (typically filled by a lake) that results from the melting of a mass of ice trapped in glacial deposits
    cavity, pit
    a sizeable hole (usually in the ground)
    chuckhole, pothole
    a pit or hole produced by wear or weathering (especially in a road surface)
    rabbit burrow, rabbit hole
    a hole in the ground as a nest made by wild rabbits
    hole made by a burrowing worm
    a sloping pit with a stake in the middle used as an obstacle to the enemy
    barbecue pit
    a pit where wood or charcoal is burned to make a bed of hot coals suitable for barbecuing meat
    borrow pit
    a pit created to provide earth that can be used as fill at another site
    (golf) the cavity left when a piece of turf is cut from the ground by the club head in making a stroke
    fire pit
    a pit whose floor is incandescent lava
    a pit filled with loose wet sand into which objects are sucked down
    a large pit in sandy ground from which sand is dug
    a pit over which lumber is positioned to be sawed by two men with a long two-handed saw
    tar pit
    a natural accumulation of bitumens at the surface of the earth; often acts as a trap for animals whose bones are thus preserved
    rabbit warren, warren
    a series of connected underground tunnels occupied by rabbits
    type of:
    depression, natural depression
    a sunken or depressed geological formation
  6. noun
    a small valley between mountains
    “he built himself a cabin in a hollow high up in the Appalachians”
    synonyms: holler
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    dell, dingle
    a small wooded hollow
    type of:
    vale, valley
    a long depression in the surface of the land that usually contains a river
  7. verb
    remove the inner part or the core of
    synonyms: dig, excavate
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    excavate horizontally
    ditch, trench
    cut a trench in, as for drainage
    type of:
    remove, take, take away, withdraw
    remove something concrete, as by lifting, pushing, or taking off, or remove something abstract
  8. verb
    remove the interior of
    hollow out a tree trunk”
    synonyms: core out, hollow out
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    gouge, rout
    make a groove in
    scallop, scollop
    form scallops in
    make holes in
    draw in, suck in
    draw in as if by suction
    scoop out
    hollow out with a scoop
    cavern, cavern out
    hollow out as if making a cavern
    cave, undermine
    hollow out as if making a cave or opening
    dig, dig out
    create by digging
    form by hollowing
    remove the core or center from
    excavate the earth beneath
    take (root crops) out of the ground
    dig a trench or trenches
    make a hole with a wooden hand tool
    type of:
    make void or empty of contents
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