Can you please comment on the use of idioms in "Miss Rosie" by Lucille Clifton?

I had to edit your
question as what you were asking for wasn't very clear. This poem does employ a very powerful,
but what you quoted in your original question certainly wasn't an idiom. An idiom is defined as
an expression that is peculiar to a certain language and cannot be understood by a mere literal
definition of its individual words....