Fall into,

Trap,

Frame,

Depression,

Trapped,

Sagging,

Trapping,

Sink,

Trapped,

Trap,

Sink,

Fall,

Frame,

Fall,

Fall,

Fall,

Trap,

Pit,

Collapse,

Collapse,

Trapped in,

Defects,

Trapping,

Trapped edge,

Collapse,

Waste collector