motormouth

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mo·tor·mouth / ˈmōtərˌmou[unvoicedth]/ (also mo·tor-mouth) • n. inf. a person who talks quickly and incessantly. DERIVATIVES: mo·tor·mouthed / -ˌmou[voicedth]d; -ˌmou[unvoicedth]t/ (or mo·tor-mouthed) adj.