sell sb on sth

چیزی که سبب علاقه مندی یا کشش کسی میشود . ( معمولا بصورت مجهول می آید )
. What sold me on the English class, was energy of the teachers
. She was not sold on the idea

to persuade someone to buy something or give support to an idea
متقاعد کردن کسی به انجام کاری
She's really sold on the idea of moving to Australia.