be on

verb

1. To be ranked at (something), based on polling.

   “The Tories are on twenty-five percent in that constituency.”

2. To be performative or funny in a wearying manner.

   “You don't have to be on all the time.”

3. To be responsible for (something).

   “That task is on you.”

4. To be up to; to be engaged in or scheduled to do imminently.

   “What are you on today?”