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English definition of “arch”

arch

adjective     /ɑːtʃ/ US  /ɑːrtʃ/
showing that you think it is funny that you know more about something than someone else does: an arch tone of voiceAffected and insincere archly     /ˈɑːtʃli/ US  /ˈɑːrtʃli/ adverb She smiled archly at him. "I fail to understand what you're suggesting," said Claire archly.Affected and insincere
(Definition of arch adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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