In both sentences, it is an adjective. In the first, it is attributive and describes "arteries". In the second it is a predicate adjective which modifies "boiler".
Student or Learner
I was looking up some words on a dictionary called "wordWeb", and found something which was a bit confusing for me to comprehend. The words used in two sentences, on WordWeb, which I am going to type below, as verbs. Please clarify how these words are functioning in the following sentences.
1- Facts about smoking and furred-up arteries.
2- The boiler has become furred up.
Is the word "furred-up", in the above first sentence, not functioning as an adjective telling us about facts or arteries?
The above second sentence is clearly telling us about boiler, that something happened to it. (Politely)Why, is it not functioning as an adjective if I am correct?
But how come, it's described as verb in both sentences on "wordWeb" dictionary?
Past and present participles of verbs are commonly used adjectivally.
That entry is wrong.
"Invading armies have no rights." Noam Chomsky
So, how is it functioning, as an adjective or as a verb?