Definitions:

1. In British English, it can refer to a foreman, supervisor, or an old man. NOUN
   • The gaffer at the construction site ensured that all the work was completed on time.
2. Informally used to refer to a person in charge, such as a boss or manager. NOUN
   • The football team's gaffer made several strategic changes during the game.
3. The chief lighting technician responsible for the design and execution of the lighting plan for a production. NOUN
   • The gaffer worked closely with the director of photography to create the perfect lighting for the scene.

Synonyms:

• boss
• Chief lighting technician
• foreman
• manager
• supervisor