(じまん)

じまん
noun
pride, boasting
1. pride, boast, something to be proud of
The act of speaking with excessive pride about one's achievements or possessions; also, something one is proud of.
My son is my pride.
People who only brag are disliked.
This dish is the pride of the restaurant.
He was boasting about having bought a new car.
Because she brags so much, her friends keep a bit of distance from her.

自慢(じまん)する is used as a する-verb meaning "to boast" or "to brag."

COMMON COLLOCATIONS:

NUANCE:
自慢(じまん)する often has a slightly negative nuance (boasting), but 自慢(じまん) + noun (something to be proud of) is neutral or positive.