Tennis is a 2 or 4 player game that is played on a rectangular court covered in clay, grass, a hard surface or an artificial surface. The players have a racket and must hit a small ball over a net to their opponent(s).​

idioms and expressions from tennis

Many idioms originated from tennis and here is a list of them with pictures and examples.

tennis idioms and expressions
tennis phrases - ball in one`s court
tennis idioms - in full swing
tennis expressions - rally around/round