What the person above said
A meter is the repetition of a word or phrase at the end of each stanza.
Adverbial clause is an adverb which is a dependent clause. It's used as an adverb in a sentence to show the time, contrast, conditions, place, reason, concession, purpose or result.
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The braising liquid has fond in it ( from carmelized drippings of meat and/or veggies that are stuck to the pan or pot after roasring or sauteing) , which can thicken sauces.