1. a small, usually U-shaped pin used to hold hair in place

1. shaped like a hairpin; making a sharp U-shaped turn
Usage: often used to describe roads or curves

Examples

• She used a hairpin to secure her bun.
• The mountain road had several hairpin turns.
• I lost a hairpin while brushing my hair.
• Drivers must slow down for the hairpin curve ahead.
• She twisted her long hair and fastened it with a hairpin.
• The hairpin turn made it difficult for large trucks to navigate.