Slacks are casual trousers. (OLD-FASHIONED)
She was wearing black ~ and a white sweater.
= trousers
N-PLURAL: also a pair of N
Slacks are casual trousers. (OLD-FASHIONED)
She was wearing black ~ and a white sweater.
= trousers
N-PLURAL: also a pair of N
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012