Definition of arch adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ɑːtʃ//
; NAmE NAmE//ɑːrtʃ//
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[usually before noun] (often disapproving) 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. Word Originadjective mid 17th cent.: from arch-, by association with the sense ‘rogue’ in combinations such as arch-scoundrel.
See the Oxford Advanced American Dictionary entry: arch