idiom · To occupy a strategic or superior position (figuratively or strategically).

守军占据了居高临下的有利地形。

idiom · To assume a haughty, patronizing, or superior attitude toward others.

他总是以一种居高临下的姿态对待同事。

expression · To be in a high physical location overlooking the scene below.

这座别墅居高临下，可以俯瞰整个海湾。