1. Teeth, especially when white and well-arranged.
Usage: informal; often used in the phrase 'flash one's pearlies'
2. Members of a London working-class subculture known for wearing clothes decorated with pearl buttons, popular in the early 20th century.
Usage: British; historical

Examples

• She flashed her pearlies in a bright smile.
• He showed off his pearlies after getting his teeth whitened.
• The pearlies were a distinctive feature of East End London culture.
• You should brush your pearlies twice a day.
• The old photograph showed the pearlies in their traditional pearl-button suits.