Final answer:
The line from Emily Dickinson's poem that contains a metaphor is "Restraining rampant squirrel."
Step-by-step explanation:
The line from Emily Dickinson's "Nature, the gentlest mother" that contains a metaphor is:
Restraining rampant squirrel
A metaphor is a figure of speech that compares two unlike things without using the words "like" or "as." In this line, the phrase "restraining rampant squirrel" is a metaphor because it compares the gentle nature of nature to a squirrel that needs to be restrained. The squirrel is not literally present or being restrained, but it symbolizes the wild and lively aspects of nature.
Learn more about Metaphor in Emily Dickinson's poem