Question

how and why does the brook bicker

Answer 1

when the Brook emerges from its birth place and flows it makes a lot of noise. This noise is compared to the noise borne out of a quarrel.

Answer 2

Bicker means to quarrel the poet uses this words because like the great noise made during a quarrel the fast flowing water of the brook makes a great noise while flowing over the hills

It bickers because it is in a hurry to flow away. This also states the youth full state of brook where it is energetic.

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