1. Busy or engaged in something:
* Positive connotation: This meaning implies someone is actively involved in something interesting or productive.
* Example: "What are you up to this weekend?"
* Neutral connotation: This meaning can be more general and simply refers to someone's current activity.
* Example: "I'm just up to some work stuff."
2. Engaging in something mischievous or suspicious:
* Negative connotation: This meaning suggests someone is doing something that could be considered wrong or dishonest.
* Example: "I saw him lurking around the back of the school. I wonder what he's up to."
The meaning is usually determined by the tone of the speaker and the context of the conversation.
For example:
* "Are you up to anything interesting?" This implies a positive expectation.
* "What are you up to tonight?" This is more general and could be either positive or neutral.
* "I think he's up to something." This implies suspicion and suggests something potentially negative.
If you're unsure of the meaning, it's always best to ask for clarification.