This is the 38th most frequent Norwegian word.
blir
"Blir" means "becomes" or "is" (present tense of "to become" or "to be").
Here, 'blir' denotes staying or remaining in a particular place.
Jeg blir hjemme i dag.
I will stay at home today.
In this sentence, 'blir' indicates undergoing a change of state, in this case becoming happy.
Han blir veldig glad for gaven.
He becomes very happy about the gift.
'Blir' functions passively here, indicating that something is being performed or will happen.