Final answer:
Meter in poetry refers to the pattern of stressed and unstressed syllables in a line of poetry.
Step-by-step explanation:
Meter in poetry refers to the pattern of stressed and unstressed syllables in a line of poetry. It helps create rhythm and musicality in the language. In the given example, if you read Sir Gawain and the Green Knight and see the words beard, bramble, and bush close to each other, it could be an example of alliteration, which is a literary device that involves the repetition of consonant sounds at the beginning of words.