Р344
ИГРАТЬ/СЫГРАТЬ НА РУКУ кому
collVPsubj:
usu. human or
collect) to help
s.o. (
usu. an adversary) or further
sth.usu. the cause of an adversary) by one's actions, often without being aware of doing so
X играет на руку Y-y = X is playing into the hands of Y (into Y's hands).