1. a horizontal beam or bar attached to a utility pole to support electrical wires, telephone lines, or other cables
Usage: technical; commonly used in electrical and telecommunications infrastructure

Examples

• The utility company installed new crossarms on the telephone poles to support additional fiber-optic cables.
• Linemen carefully balanced on the crossarm while repairing the power lines.
• The wooden crossarm had rotted and needed to be replaced with a fiberglass one.
• Multiple crossarms on a single pole can hold dozens of different utility lines.
• The crossarm extends perpendicular to the pole to distribute the weight of the cables evenly.