If you take someone up on their offer or invitation, you accept it.
Since she’d offered to babysit, I took her up on it.
PHRASAL VERB: V n P P n
If you take someone up on their offer or invitation, you accept it.
Since she’d offered to babysit, I took her up on it.
PHRASAL VERB: V n P P n
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012