庇を貸して母屋を取られる

ひさしをかしておもやをとられるhisashiokashiteomoyaotorareru

expression · ichidan verb

1. to have one's kindness taken advantage of
2. give him an inch and he'll take a mile
3. to lend out the eaves but have one's whole house taken
4. to have a favor returned with spite

Study it in Yanamino