English Reference
verb · noun

harness

v. · n.
US /ˈhɑɹnəs/ UK /hˈɑːnɪs/ har·ness UK spelling harnessed, harnesses, harnessing

  1. 01 B2 Upper Intermediate

    v.to control and use a natural force or a quality to produce something useful, like energy.

    v.to capture, control, and utilize a natural resource or specific capacity for a particular purpose.

    Simple

    The new power plant will harness the energy of the wind to provide electricity.

    In context

    Engineers are looking for more efficient ways to harness solar radiation in regions with high cloud cover.

    Usage

    Often used with natural forces like wind, water, or sun, or abstract qualities like 'potential'.

  2. 02 B2 Upper Intermediate

    v.to put a set of straps on an animal or person to control them or keep them safe.

    v.to equip an animal or person with a harness for the purpose of restraint, safety, or traction.

    Simple

    The farmer had to harness the horses before they could pull the heavy wagon.

    In context

    Before the climb began, the instructor showed the students how to harness themselves correctly to the safety ropes.

    unharness
  3. 03 B2 Upper Intermediate

    n.a set of straps that fits around a person's or animal's body to keep them safe or to pull something.

    n.a system of straps and fittings by which a horse or other animal is fastened to a cart or plough, or a similar arrangement for a human.

    Simple

    The baby was strapped securely into his high chair with a five-point harness.

    In context

    The safety inspector checked each climber's harness for signs of wear before allowing them onto the rock face.

  4. 04 C1 Advanced Technical Technical

    n.a group of wires or cables tied together in a specific way, usually inside a machine or car.

    n.an assembly of electrical cables or wires which transmit signals or electrical power.

    Simple

    The mechanic found a loose connection in the car's main wiring harness.

    In context

    The aerospace technician spent hours mapping the complex wiring harness within the satellite's propulsion module.

  5. 05 C2 Proficiency ArchaicLiterary

    v.to put protective metal armour on a soldier or a horse.

    v.to equip a person or horse with defensive armour.

    Simple

    The knight was harnessed in gleaming steel before the battle began.

    In context

    In the old tales, the king's stallion was harnessed in silver plates that shone like the moon.

    Teacher's tip

    This sense is archaic; modern learners will almost exclusively encounter 'harness' in the context of energy or safety equipment.

Harness that back-to-school energy to set some new goals.

The New York Times· 4 Sept 2026

Yirenkyi’s biggest challenge was learning how to harness his power.

The Guardian· 20 Aug 2026
This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated