Answer:

RUBITIN

Answer	Crossword Clue
RUBITIN	Make the smarting worse
RUBITIN	Gloat, maybe
RUBITIN	Add insult to injury

RUBITIN	Be a poor winner, perhaps
RUBITIN	Tease mercilessly
RUBITIN	"Go ahead, gloat!"
RUBITIN	Add salt to a wound
RUBITIN	Overdo the gloating
RUBITIN	Remind again and again of an error
RUBITIN	Cry "nyah, nyah!"
RUBITIN	Gloat

RUBITIN	Be a very poor winner
RUBITIN	Offer unwanted reminders
RUBITIN	Add salt to the wound