Longman Dictionary of Contemporary English
short back and sides
noun
EXAMPLES FROM CORPUS
▪ And unlike hairdressers, you only have to learn one style - short back and sides.
▪ Could merge into the neck like a short back and sides. 2.
▪ Give them a short back and sides and give them a taste of the birch.
▪ His hairdresser had said tactfully that short back and sides was no longer an unquestioned good thing.
Wiktionary
short back and sides
n. A typically men's haircut where the sides and the back are left shorter than the top of the hair.
Usage examples of "short back and sides".
England was full of words I'd never heard before - streaky bacon, short back and sides, Belisha beacon, serviettes, high tea, ice-cream cornet.
Instead of the old-fashioned short back and sides his hair curled greasily down to his shoulders.