plug away
US /plʌɡ əˈweɪ/
UK /plʌɡ əˈweɪ/

1.
bekerja keras, berusaha gigih
to work hard and steadily at something, especially over a long period
:
•
She had to plug away at her thesis for months before it was finished.
Dia terpaksa bekerja keras pada tesisnya selama berbulan-bulan sebelum ia selesai.
•
If you just plug away, you'll eventually see results.
Jika anda terus bekerja keras, anda akhirnya akan melihat hasilnya.