Definition of arch verb from the Oxford Advanced American Dictionary

     

    arch

     verb
    verb
    NAmE//ɑrtʃ//
     
    Verb Forms present simple I / you / we / they arch
     
    he / she / it arches
     
    past simple arched
     
    -ing form arching
     
     
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  1. 1[transitive, intransitive] arch (something) if you arch part of your body, or if it arches, it moves and forms a curved shape The cat arched its back and hissed.
  2. 2[intransitive] to be in a curved line or shape across or over something Tall trees arched over the path.
See the Oxford Advanced Learner's Dictionary entry: arch