pre ˈvail on pre ˈvail up ˌon [transitive] [present tense I/you/we/they prevail on he/she/it prevails on present participle prevailing on past tense prevailed on past participle prevailed on] formal phrasal verb
to ask or persuade someone to do something
They might be prevailed upon to come with us.
Thesaurus: to encourage someone to do or to not do somethingsynonym
Main entry: prevail
Useful english dictionary. 2012.