knock yourself out
US /nɑk jərˈsɛlf aʊt/
UK /nɑk jərˈsɛlf aʊt/

1.
silakan saja, lakukan sesukamu
used to tell someone that they can do something if they want to, even if you think it is not a good idea or will not be successful
:
•
You want to try to fix the car yourself? Sure, knock yourself out!
Kamu mau coba perbaiki mobil sendiri? Tentu, silakan saja!
•
If you think you can finish all that work by yourself, knock yourself out.
Jika kamu pikir kamu bisa menyelesaikan semua pekerjaan itu sendiri, silakan saja.