swimming cap
US /ˈswɪm.ɪŋ ˌkæp/
UK /ˈswɪm.ɪŋ ˌkæp/
1.
a close-fitting cap worn by swimmers to keep their hair dry and reduce drag in the water
:
•
She put on her swimming cap before diving into the pool.
•
A swimming cap helps to protect your hair from chlorine.