expression, ichidan verb
self-advertise; boast; dwell on one's merits
Used when someone goes on at length about their own abilities, achievements, or the good points of something they are associated with. Often carries a negative or mocking tone.
See also: 能書き
彼は自分の経験について能書きを垂れるのが好きだ。
He likes to boast about his own experiences.
He just kept dwelling on the product's merits without explaining how it actually works.