play into someone's hands
US /pleɪ ˈɪntu ˈsʌmwʌnz hændz/
UK /pleɪ ˈɪntu ˈsʌmwʌnz hændz/

1.
birinin ekmeğine yağ sürmek, birinin işine gelmek
to do exactly what your opponent wants you to do, so that they gain an advantage over you
:
•
By arguing with him, you're just playing into his hands.
Onunla tartışarak sadece onun ekmeğine yağ sürüyorsun.
•
The opposition's mistakes played right into the government's hands.
Muhalefetin hataları hükümetin ekmeğine yağ sürdü.