sag 
(săg)
(săg)v. sagged, sag·ging, sags
v.intr.
1. To sink, droop, or settle from pressure or weight.
2. To lose vigor, firmness, or resilience: My spirits sagged after I had been rejected for the job.
3. To decline, as in value or price: Stock prices sagged after a short rally.
4. Nautical To drift to leeward.
5. To wear one's pants with the waist below the hips, so that one's underwear is visible.
v.tr.
To cause to sag.
n.
1.
a. The act or an instance of sagging.
b. The degree or extent to which something sags.
2.
a. A sagging or drooping part or area: tried to brush out the paint sags.
b. A sunken area of land; a depression.
3. A sagging area; a depression.
4. A decline, as in monetary value.
5. Nautical A drift to leeward.
[Middle English saggen, probably of Scandinavian origin; akin to Swedish sacka, to sink.]
saggy adj.