Definition: When 2 teams have the same number of points in a competition, they play a match to decide who the winner is.
(This phrasal verb has more than one meaning)
E.g.1: Manchester United and Liverpool will play off to decide second and third place in the European Cup.
E.g.2: Who one the competition? It was a draw, so they’ll play off next week.
This phrasal verb cannot be separated.