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1. For an additional weight to burden or bend something or cause it to droop. The fallen tree must have weighed on the other to the point that both fell. I'm just worried about all the snow weighing on the roof.
2. By extension, to be a burden or impediment to. A noun or pronoun can be used between "weigh" and "on." It feels good to finally get that off my chest. The guilt has weighed on me for years. All the extra orders have been weighing on us a bit, but hopefully we'll be able to get back to normal operations after the holidays.
weigh (up)on someone
Fig. to burden or worry someone. (Upon is formal and less commonly used than on.) The problems at the office were beginning to weigh upon Mr. Franklin. My problems began to weigh on me.
Also, weigh upon. Depress, as in His criticism weighed on her, or The long silence began to weigh upon us. This idiom was first recorded in 1775.
weigh onor weigh upon
1. To cause to sink or bend heavily by or as if by added weight: The bad news weighed on the prices of oil stocks. A coating of ice weighed upon the slender branches.
2. To preoccupy someone with a feeling of guilt or blame: The consequences of their mistake weighed on them. Heavy guilt weighed upon the thief.