/ ˈbænə(r); NAmE / noun
a long piece of cloth with a message on it that is carried between two poles or hung in a public place to show support for sth :
Protesters carried a banner reading 'Save our Wildlife'.
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IDIOMS
- under the banner (of sth)
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WORD ORIGIN
Middle English : from Old French baniere , ultimately of Germanic origin and related to band musical group .