4040 is deuce in tennis
For the points 40-40 each, the term used in Tennis is 'deuce'.
Often used as a slang term for tennis shoe.
badminton and tennis both
The term 'Love' is used in both Badminton and Tennis.
The noun "volley" is used as a collective noun for a volley of shots; a term used for gunfire or for tennis.
'40-40 player' is a term used for someone that hits 40 (or more) doubles and 40 (or more) home runs in the same season.
A tennis swing on the strong side of the body is called a forehand.