1. A thin, U-shaped pin used to hold hair in place, typically made of metal or plastic.
2. A sharp U-shaped turn in a road, especially on a mountain or steep slope.

1. Shaped like a hairpin; making a sharp U-shaped turn.

Examples

• She used a hairpin to secure her bun.
• The mountain road had several dangerous hairpin turns.
• The driver navigated the hairpin curve carefully.
• I found a hairpin on the bathroom floor.
• The hairpin bend required the car to slow down significantly.
• She twisted her hair up and fastened it with a hairpin.