Final answer:
The 'lark' in Sonnet 29 symbolizes a bird singing at dawn, while 'sullen' describes the earth as gloomy, creating a contrast that highlights the lark's uplifting presence.
Step-by-step explanation:
In the lines from Sonnet 29, the word "lark" refers to a type of bird known for its beautiful song, commonly associated with the early morning. It is often a symbol of heralding in the dawn or representing a spiritual ascension, as it flies high while singing. In contrast, "sullen" describes an earth that is gloomy, dull, or morose.
It conveys a sense of heaviness and discontent, providing a backdrop against which the lark's ascent and song are even more poignant and uplifting.
The word 'lark' in the given lines of Sonnet 29 refers to a type of songbird known for its melodious singing. In this context, the poet compares the lark to an optimistic and joyful creature that rises up from the 'sullen' or gloomy earth and sings beautiful songs at heaven's gate.