HO-HUM
Meaning of HO-HUM in English
/ ˌhəʊ ˈhʌm; NAmE ˌhoʊ/ exclamation
used to show that you are bored
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WORD ORIGIN
1920s: imitative of a yawn.
Oxford Advanced Learner's English Dictionary.
Оксфордский английский словарь для изучающик язык на продвинутом уровне.
2005