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Definition of arch adjective from the Oxford Advanced American Dictionary

 

arch

 adjective
adjective
NAmE//ɑrtʃ//
 
[usually before noun] (often disapproving)
 
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seeming amused because you know more about a situation than other people an arch tone of voice He tapped the side of his nose in an uncharacteristically arch gesture.
arch‧ly adverb
 
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“Guess what?” she said archly.
See arch in the Oxford Advanced Learner's Dictionary