beg the question

[beg the question] {v. phr.}, {literary} To accept as true something that is still being argued about, before it is proved true; avoid or not answer a question or problem.

The girls asked Miss Smith if they should wear formal dresses to the party; Miss Smith said they were begging the question because they didn't know yet if they could get permission for a party.

Laura told Tom that he must believe her argument because she was right. Father laughed and told Laura she was begging the question.