godan verb (-su), transitive verb
show off; flaunt; make a display of
Used when someone ostentatiously displays something they are proud of, such as wealth, knowledge, or possessions. Often carries a negative connotation of boastfulness.
彼は新しい車をひけらかしている。
He is showing off his new car.
知識をひけらかす人はあまり好かれない。
People who flaunt their knowledge are not well liked.