Answer:
The definition of the word foul:
1. This can be used to describe a play that doesn't count in a sports game.
2. This can be used to describe something very disgusting or gross.
When connecting 2+ ideas in 1 speech, transition words and repetition of key words is useful to bridge the two subjects (aka relate them to one another).
The poet compared imagination to a soaring bird because imagination is limitless, it can do anything and go anywhere, much like a soaring bird, who has the freedom and capabilites to do anything. Both are completely free of bounds.
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