The expression "a fox that borrows the fearsomeness of a tiger" is used to describe some one who bullies the weak through his association with the powerful.
狐狸為了求生，只好運用機智去欺騙老虎，它的動機還情有可原；而我們為人處世，所靠的應該是真才實學，千萬不能學狐狸那樣。