tongue-in-cheek
adjective
UK: /ˌtʌŋ.ɪnˈtʃiːk/
US: /ˌtʌŋ.ɪnˈtʃiːk/
If you say something tongue-in-cheek, you say it in a joking way, not seriously.
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He made a tongue-in-cheek remark about her new hat.
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The movie is a tongue-in-cheek look at the world of fashion, exaggerating trends.