If the sky clouds over, it becomes covered with clouds.
After a fine day, the sky had clouded over and suddenly rain lashed against the windows.
PHRASAL VERB: V P
see also cloud 5
If the sky clouds over, it becomes covered with clouds.
After a fine day, the sky had clouded over and suddenly rain lashed against the windows.
PHRASAL VERB: V P
see also cloud 5
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012