Most phrases can be understood by thinking about what each word means. General meaning Back means rear, or farthest away Boundary means a specified line separating two places. A line is often thought of as straight, but can be an uneven line. A line also delineates areas. So a "back boundary line" is a specified boundary at the rear. Your back yard has a "back property line" as does a tennis court. Note: Also see Tennis terms.
The inside line is the boundary for tennis when playing singles. The outside line is the boundary in Doubles.
soccer and tennis
the rebound
a rally
The autobiography titled "Hitting Back" was written by tennis legend Martina Navratilova. It was published in 1985 and details her life and career in professional tennis.
The bouncing back of a wave as it meets a surface or boundary is called reflection. This phenomenon occurs when the wave encounters a barrier that prevents further propagation, causing it to be redirected back in the opposite direction.
the back boundary line, and the long service line
The boundary between two materials is called an interface.
transform boundary
The back of a badminton court is a back boundary line and long service line for singles.
Divergent Boundary, (Constructive Boundary).