/ ˈhʌbʌb; NAmE / noun [ sing. , U ]
1.
the loud sound made by a lot of people talking at the same time :
It was difficult to hear what he was saying over the hubbub.
2.
a situation in which there is a lot of noise, excitement and activity :
the hubbub of city life
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WORD ORIGIN
mid 16th cent.: perhaps of Irish origin; compare with the Irish exclamations ababú , abú , used in battle cries.