General:
* Expand: This is a very common synonym for "enlarge," meaning to increase in size or scope.
* Extend: Similar to expand, but often implies adding to something existing.
* Amplify: To make something bigger or louder.
* Augment: To increase in size or amount.
* Grow: This implies natural increase in size.
* Increase: To make something bigger or greater in amount.
* Magnify: To make something appear larger.
Specific:
* Widen: To make something broader.
* Lengthen: To make something longer.
* Deepen: To make something more profound or intense.
* Broaden: To make something wider or more inclusive.
* Stretch: To make something longer or wider by pulling it.
The best synonym for "enlarge" will depend on the specific context of your sentence.