Deuce is where both players are on 40 in a match of tennis
deuce= 40 all or 40-40
That score is referred to as deuce.
After a deuce score, the next score will be advantage-[player's name who won the point]. This is sometimes abbreviated to ad-[player's name].
It is called a Deuce.
In tennis, when both opponents are tied at 40-40, the score is called deuce. Deuce changes to advantage when one opponent scores after achieving deuce.
Deuce means a tied score. Also it can be used in tennis, badminton and some indoor games.