Definitions for backcourtˈbækˌkɔrt, -ˌkoʊrt
Random House Webster's College Dictionary
the half of a basketball court in which the basket being defended is located.
the part of a tennis court between the base line and the line that marks the in-bounds limit of a service.
Ref: Compare forecourt (def. 1). 1
Origin of backcourt:
A courtyard behind a housing block or tenement building.
A team's defensive half of the court; the part of the court where the other team's basket is located, or the guards playing in that area.