Terminology
What's the difference between Down and Not up
"Down" is when the ball is correctly struck, but hits the floor or the tin. "Not up" is when the ball is incorrectly struck, eg a double bounce, a double hit or carry.
Out of Court - what's the correct call ?
When the ball goes out of court - on or above the top lines, or on a glassback court on the top of the back wall, the correct call is "out"