The word ‘chatter’ has been repeatedly used in the poem. The first use is, “I chatter over stony ways.” The second time it is, “I chatter, chatter as I flow.” The word ‘chatter’ means to talk quickly in a friendly way, without stopping. The poet uses the appropriate word to denote the non-stop talking sound of the brook while it is negotiating its stony ways. Even the sound of the flowing river is repeatedly called ‘chatter’ as it is constant, non-stop and friendly.