Select the most appropriate meaning of the given idiom.

By and by

Gradually

The most appropriate meaning of the idiom "by and by" is >gradually.<

It means in a short while or eventually. It is often used to describe something that happens slowly or over time.

The other options are not correct.

• On the whole: This means generally or overall.
• By any means: This means in any way possible.
• Suddenly: This means quickly and without warning.