There are 3 definitions of BO in English:

BO

Line breaks: BO
Pronunciation: /biːˈəʊ
 
/

abbreviation

informal
  • Body odour.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody

There are 3 definitions of BO in English:

bo1

Line breaks: bo
Pronunciation: /bəʊ
 
/

exclamation

Origin

late Middle English: imitative.

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Definition of bo in:

There are 3 definitions of BO in English:

bo2

Line breaks: bo
Pronunciation: /bəʊ
 
/

noun

US informal
  • Used as a friendly form of address.

Origin

early 19th century: perhaps an abbreviated form of boy.

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