In English, many past and present participles of verbs can be used as adjectives. Some of these examples may show the adjective use.
Although the male's attention seems to beperkingup, he in fact becomes less involved as the female continues to talk about the article.
From theCambridge English Corpus
He isperkingup a little.
From the
Hansard archive
Example from the Hansard archive. Contains Parliamentary information licensed under theOpen Parliament Licence v3.0
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.