loudmouth

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loud·mouth / ˈloudˌmou[unvoicedth]/ • n. inf. a person who tends to talk too much in an offensive or tactless way.DERIVATIVES: loud·mouthed / ˈloudˌmou[voicedth]d; -ˌmou[unvoicedth]t/ (also loud-mouthed) adj.

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