In this line, the verb “bends” means to stoop or bow towards something. In this way it once again highlights the bird’s littleness and the large stature of the man standing over her. The man's “bending” demonstrates his lack of interest in the only action that this bird is allowed to do. He does not sit to hear her sing or arrive to hear her sing; he bends, a brief action that signifies a lack of commitment or interest.
The verb “to bind” suggests a type of restraint. The adjective “wandering” in this context represents freedom of movement. That He “caught and bound” her suggests the use of violence and force. The verbs used in this line further clash with the speaker’s eerily pleasant and complacent tone, suggesting that readers should look past what is directly stated for the violence behind the speaker’s words.
The now-archaic pronoun “naught” simply means “nothing.” The little bird, trapped in a cage, has only one thing that it can do: sing. Beginning the second stanza with this word indicates the boredom and despair that the captive feels as she resigns herself to performing the only action that she can in the cage.
While the word “fields” technically refers to land on the earth, it can be used to symbolically represent wide, open expanses. The phrase “fields of air” describes the freedom and endless possibilities that the speaker enjoyed prior to her imprisonment.
