Urge or goad to action, as in If we don't light a fire under that committee, they'll never do any work. This hyperbolic colloquialism uses light in the sense of “ignite,” a usage dating from the mid-1100s.
goods and materials purchased by organisations for use in production, administrative, clerical or marketing activities, but not directly in the manufacture of finished products.
A hat is a head covering which is worn for various reasons, including protection against weather conditions, ceremonial reasons such as university graduation, religious reasons, safety, or as a fashion accessory.
Footwear in the manner of shoes therefore primarily serves the purpose to ease locomotion and prevent injuries.