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Definition of collapsible
: able to be folded into a more compact shape
a collapsible stepladder The collapsible bikes were created in London with the city commuter in mind …— Karen Loutzenheiser also, of a part of a graphical user interface : able to be hidden or to have certain components (such as options in a menu) hidden by the user when not needed The use of a collapsible menu keeps the navigation less cluttered, but keeps all functionality at your fingertips. — Susan Perschke
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Time Traveler for collapsible
The first known use of collapsible was in 1843
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