1. A fine, white or grayish clay used for making tobacco pipes and for whitening leather and other materials.

1. To whiten or clean with pipeclay.
Usage: chiefly British; historical
2. To subject to excessive military discipline or rigid rules; to enforce strict adherence to regulations.
Usage: British military slang; dated

Examples

• The potter selected pipeclay for crafting delicate tobacco pipes.
• Soldiers were required to pipeclay their belts and equipment for inspection.
• The regiment was known for its strict pipeclay discipline.
• Pipeclay was traditionally used to whiten military webbing and leather gear.
• The white powder used to pipeclay the uniforms left marks on the soldiers' hands.