weigh on
weigh upon
weigh on one's mind
To be a weight or pressure on; be heavy on.
The pack weighed heavily on the soldier's back.
To make sad or worried; trouble; disturb; upset.
Sadness weighed on Mary's heart when her kitten died.
John's wrongdoing weighed upon his conscience.
The teacher's advice weighed upon Tom's mind.
To be a burden to.
His guilt weighed heavily upon him.
weight of the world on one's shoulders
world on one's shoulders
world on one's back
A very heavy load of worry or responsibility; very tired or worried behavior, as if carrying the world; behavior as if you are very important.
Don't look as if you had the weight of the world on your shoulders, Henry, just because you have to mow the lawn.
John acts as if he were carrying the world on his back because he has a paper route.