When you block off a door, window, or passage, you put something across it so that nothing can pass through it.
They had blocked off the fireplaces to stop draughts.
PHRASAL VERB : V P n (not pron) , also V n P
When you block off a door, window, or passage, you put something across it so that nothing can pass through it.
They had blocked off the fireplaces to stop draughts.
PHRASAL VERB : V P n (not pron) , also V n P
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006