per ‧ ish ‧ ing /ˈperɪʃɪŋ/ BrE AmE adjective British English spoken
1 . very cold:
It was perishing in the tent.
Let’s go indoors. I’m perishing!
2 . [only before noun] old-fashioned informal used to describe someone or something that is annoying you:
Tell those perishing kids to shut up!
—perishingly adverb