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English definition of “arch”

arch

verb [I or T]     /ɑːtʃ/ US  /ɑːrtʃ/
C2 to make the shape of an arch: Trees arch over the river. Her eyebrows arched in contempt. She watched the cat arch its back.Bending, twisting and curving
(Definition of arch verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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