Question

what do you mean by the lungs laugh and throat cry

Answer 1

The poet tells about a boy who is riding downhill and enjoying himself. The lines depict a state of jubilation wherein his lungs laugh, he cries aloud and talks to a bird and imagines himself flying in the air.

Here, in these lines writer has used the literary device of personification as lungs and throat are parts of a body and they are given the humanistic characteristics of laughing and crying.

Answer 2

the poet wants to have a whole hearted laugh while riding downhill on a bicycle as it is a joyful moment to him and he is telling the bird that he is feeling that he is also flying like the bird, which he feels when the wind passes by him.