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English definition of “undertone”


noun (QUIET VOICE)    /ˈʌn.də.təʊn/ US  /-dɚ.toʊn/
in an undertone in a very quiet voice: Freddie muttered something to me in an undertone.Ways of talking
(Definition of undertone noun (QUIET VOICE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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