If you ask someone for something on ~ knee, you ask them very seriously for it. (FORMAL)
We beg the Government on ~ knees not to cut this budget.
PHRASE: usu PHR after v
If you ask someone for something on ~ knee, you ask them very seriously for it. (FORMAL)
We beg the Government on ~ knees not to cut this budget.
PHRASE: usu PHR after v
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012