This is the 11286th most frequent Swedish word.
muntra
"Muntra" means "to cheer up" or "to brighten" in English.
Here, 'muntra upp' is used as a verb phrase meaning 'to cheer up', emphasizing emotional uplifting.
Hon försökte muntra upp mig när jag kände mig ledsen.
She tried to cheer me up when I felt sad.
In this case, 'munter' is an adjective meaning 'cheerful', describing the mood or nature of the story.
Det var en munter historia som fick oss alla att skratta.
It was a cheerful story that made us all laugh.
Here, 'muntra' functions as an adjective 'cheerful', used to describe the song's uplifiting attribute that positively impacted the atmosphere.