What Does Brimming River Mean?

the meaning of brimming river means an overflowing river. it means the the water is filled till the top.

How does the brimming river flow?

To join the brimming river, For men may come and men may go, ... Here, it joins with another river which is full of water—to the brim. Men may come or go (take birth or die) from this world but the brook continues to flow forever.

What flows to join the brimming river in the poem The Brook?

With willow-weed and mallow. To join the brimming river, For men may come and men may go, But I go on forever.