General alternatives:
* Juggle
* Handle multiple responsibilities
* Do several things at once
* Work on several tasks simultaneously
* Attend to multiple duties
* Manage multiple tasks
* Balance multiple priorities
More specific alternatives:
* Concurrent (emphasizes happening at the same time)
* Simultaneous (similar to concurrent)
* Parallel (suggests tasks happening independently but at the same time)
* Interweave (implies tasks are intricately linked)
* Commute (used for switching between tasks quickly)
* Shift (implies a change of focus between tasks)
* Expedite (suggests efficiently handling multiple tasks)
Informal alternatives:
* Do double duty
* Wear many hats
* Be a busy bee
The best word will depend on the specific situation and the tone you're trying to convey.