prevail on/upon somebody phrasal verb formal ( see also ↑ prevail )
to persuade someone
prevail on/upon somebody to do something
She prevailed upon her father to say nothing.
prevail on/upon somebody phrasal verb formal ( see also ↑ prevail )
to persuade someone
prevail on/upon somebody to do something
She prevailed upon her father to say nothing.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012