(~s)
1.
A ~ is a group of four people who play musical instruments or sing together.
...a string ~.
...a ~ of singers.
N-COUNT-COLL
2.
A ~ is a piece of music for four instruments or four singers.
N-COUNT
(~s)
1.
A ~ is a group of four people who play musical instruments or sing together.
...a string ~.
...a ~ of singers.
N-COUNT-COLL
2.
A ~ is a piece of music for four instruments or four singers.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012