hairpin (hairpins plural )
1 n-count A hairpin is a small piece of metal or plastic bent back on itself which someone uses to hold their hair in position.
(=hairgrip)
2 n-count A hairpin is the same as a hairpin bend.
hairpin bend (hairpin bends plural )A hairpin bend or a hairpin is a very sharp bend in a road, where the road turns back in the opposite direction. n-count