render something to someone—
1. give or provide smth. (such as assistance, etc.) to a person:
- Young volunteer workers render a valuable service to the community.
2. surrender smth. such as a fort, city, etc. to the enemy:
- The capital of French America was rendered to the English, after a most severe campaign.
render something up to someone— = render something to someone 2:
- After a prolonged siege, the town was rendered up to the insurgents.