bun
US /bʌn/
UK /bʌn/

1.
2.
chignon
a person's hair when it is gathered into a round mass on top of or at the back of the head
:
•
She tied her long hair into a neat bun.
Elle a attaché ses longs cheveux en un chignon soigné.
•
The ballerina wore her hair in a tight bun.
La ballerine portait ses cheveux en chignon serré.