sag
Definitions
To sink, hang, or bend downward, especially in the middle, under weight or pressure.
To decline or decrease in value, amount, or intensity.
A downward curve or dip in a surface or structure.
Examples
The old mattress began to sag in the middle after years of use.
The heavy snow caused the branches of the pine tree to sag toward the ground.
Her confidence seemed to sag as she realized how difficult the task would be.