sag
n. countable B2 Upper Intermediate US //ˈsæɡ// UK //sˈæɡ// sag
n. a part of something that hangs down or curves because it is heavy or loose. You might notice this in an old shelf or a piece of clothing that doesn't fit well.
n. a downward curve or dip caused by weight, pressure, or a lack of structural tension. Often refers to the physical displacement of a surface or material from its original horizontal plane.
The old wooden shelf has a noticeable sag in the middle.
After years of heavy use, the mattress developed a deep sag that made it uncomfortable to sleep on.
Engineers must calculate the potential sag of the suspension cables to ensure the bridge remains stable under the weight of peak-hour traffic.
Usage
Often used with the verb 'develop' or 'show'.