Use 'weigh down' to describe objects literally made heavy by something.

Physical Weight

'Weigh down' can imply something is visibly sagging or drooping under weight.

Visibility

While it sounds negative, 'weigh down' can be neutral, it depends on context.

'Weigh down' can be used metaphorically to express emotional or mental strain.

'Weigh down' suggests a pressure that persists over time, not just a moment.

'Weigh down' covers various negative feelings, not just sadness or worry.

It can describe anything that slows down progress, not just physical movement.

The effect of being 'weighed down' happens gradually, not instantly.