alliteration
US /əˌlɪt̬.əˈreɪ.ʃən/
UK /əˌlɪt̬.əˈreɪ.ʃən/
1.
the occurrence of the same letter or sound at the beginning of adjacent or closely connected words.
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The poem used alliteration with the phrase 'slippery, slithering snake'.
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Children's books often feature alliteration to make them more engaging.