come off one's perch

1. 不再骄傲自大

Come off your perch and stop considering yourself as the most important person here.

别狂妄了, 不要自以为这儿你是老大。

knock sb. off his perch

1. 把某人毁掉; 击败某人

He's always finding fault with us; we'll have to find some way to knock him off his perch one of these days.

他老是找我们麻烦; 哪一天我们也要设法让他认输。