sagging

The act of something that sags.

It was noticed that there had been saggings and bulgings in the trays.

Overhead line electrification near London Euston is being overhauled in a four-week Network Rail project to reduce delays in hot weather. The OLE at Camden is being renewed and replaced to help prevent sagging, with some 2,000 metres of new wires being installed.

A manner of wearing pants or shorts below the waist, revealing some or all of the underwear.

Worn low on the waist, or wearing pants or shorts low on the waist.

Hanging down loosely.

For OLE, the same is true for sagging overhead wires. Slower trains are less likely to cause a dewirement - and make less mess even if they do pull the wires down.