To-do (noun)

1. A task or set of tasks to be done.
2. An event or activity.
3. A commotion or fuss.

Origin:

From the phrase "to do" meaning "something that needs to be done".

Examples:

1. He made a list of all the things he needed to do today.
2. She had a long to-do list and didn't know where to start.
3. The party was a big to-do and everyone had a great time.
4. He made a to-do about the spilled drink.
5. She was busy with her to-do list and didn't have time to talk.