Here’s a quick update on slang uses of “arch” and how people are using it now.
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Primary meaning in slang: “arch” often describes a playful, mildly teasing, or mischievous tone. Someone with an “arch” sense of humor acts superior or sly in a lighthearted way. This usage is common in descriptions like “an arch remark” or “an arch smile.”[3][4]
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Common phrases you might see: “arch irony,” “arch enemy,” and “arch humor” are typical collocations. They signal a deliberately witty or superior flair in the speaker’s attitude.[4][3]
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Popular culture notes: in online communities and memes, “arch” is sometimes used to label a persona that presents itself as witty or cultured in a slightly condescending way, often in a joking context. This is especially visible in British slang and meme culture.[7][8]
If you want, I can pull more examples from current social media or blogs to show how people are using arch in sentences today.