dictionnaire Polonais - Anglais
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upierać się przy Anglais:
1. 
insist on
I insist on having a lot of practice in English
he insist on paying for my dinner
Why did you insist on leaving early?
If you insist on something, you say that you must have it or it must be done.
I don't know why you insist on talking about it.
I will insist on opening the shops on Sunday.
to insist on doing sth
to persist in 
to hold out for 