arch - definition and synonyms

noun [countable] 

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  1. 1
    a curved structure at the top of a door, window, or gate

    the arch above the front door

    1. a.
      a structure with a curved top and two straight sides that you can walk through

      a garden arch

    2. b.
      a curved structure, especially one that supports a building or a bridge

      Many people sheltered under the arches of the bridge.

       Synonyms and related words
  2. 2
    the curved part on the bottom of your foot