1. reinforced or supported (a structural beam or joist) by attaching another beam alongside it
Usage: construction; carpentry

Examples

• The contractor sistered the damaged floor joist with a new piece of lumber.
• We sistered the sagging beam to prevent further structural problems.
• The old rafters were sistered with steel reinforcements.
• After the inspection, several joists needed to be sistered for safety.
• The carpenter sistered the cracked support beam with a matching timber.