A Rounders ball struck sideways and entering foul ground from the batter’s/catcher’s box will be called...

A Rounders ball that is hit sideways and enters foul ground from the batter's/catcher's box will be called a foul ball. Here are the steps that lead to this conclusion:

1. In the game of Rounders, similar to baseball, the playing field is divided into fair and foul territories. The fair territory is the part of the field that is inside the two foul lines, which extend from the home base through the first and third bases to the boundary of the field. The rest of the field is the foul territory.

2. When the batter hits the ball, the ball can land in either the fair or foul territory. The location where the ball first touches the ground or an object determines whether it's a fair or foul ball.

3. If the ball first touches the ground in the fair territory, it's a fair ball. If it first touches the ground in the foul territory, it's a foul ball.

4. In your scenario, the ball is hit sideways and enters the foul ground from the batter's/catcher's box. This means that the ball first touches the ground in the foul territory.

5. Therefore, the ball will be called a foul ball.