Hinges allow the door to move to and fro.

here what does fro means.

To and fro means the forward and backward movement of an object about an equilibrium position. For instance, motion of a pendulum, it moves one side to another, and then returns to the starting position. This type of motion is known as to and fro motion.

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fro means forward...

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in annular moment

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To and fro means the forward and backward movement of an object about an equilibrium position. For instance, motion of a pendulum, it moves one side to another, and then returns to the starting position. This type of motion is known as to and fro motion.

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Forward and backward movement.

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