to collapse or cave in; a collapse, as of a building or structure

To collapse or break down, especially in reference to a career, business, or a general situation

(of roads, mountains, or tunnels) to cave in or collapse

to fall down or cave in, especially referring to buildings or large structures

to collapse or fall down, especially referring to a mountain side, cliff, or large structure; landslide

to cave in; to give way; to sink in

to collapse and be destroyed; dilapidation

The dark sphere formed when a star collapses under its own gravity after exhausting its fuel, reaching a stage where gravity prevents light from escaping; also called a [[黑洞|黑洞|hei1 dong4]].