This is the 665th most frequent Azerbaijani word.
bəzən
"sometimes"
The use of 'bəzən' here shows that the cheerful behavior is not constant but occurs periodically.
O, bəzən çox şən olur.
He/She is sometimes very cheerful.
'Bəzən' indicates an action that happens occasionally, not regularly.
Mən bəzən kitab oxuyuram.
I sometimes read books.
The word 'bəzən' means 'sometimes' and is used to express occasional occurrences.