backyard
US /ˌbækˈjɑːrd/
UK /ˌbækˈjɑːrd/

1.
2.
quintal, esfera de influência
a person's own area of activity or interest; one's own sphere of influence.
:
•
He considers the entire region his backyard.
Ele considera toda a região seu quintal.
•
Local politics is his backyard, he knows everything about it.
A política local é o seu quintal, ele sabe tudo sobre isso.