Answer: rubitin

AnswerCrossword 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!"
RUBITINAdd salt to a wound
RUBITINOverdo the gloating
RUBITINRemind again and again of an error
RUBITINCry "nyah, nyah!"
RUBITINGloat
RUBITINBe a very poor winner
RUBITINOffer unwanted reminders
RUBITINAdd salt to the wound