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weigh something against something
to ponder something by balancing it against something. I weighed going to town against staying here and sleeping and I decided to stay here. When I weigh your suggestion against my own ideas, I realize that I must follow my own conscience.
weigh against someone or something
Fig. to count against someone or something; [for some fact] to work against someone or something. I hope my many absences do not weigh against me on the final grade. This will weigh against you.
1. To compare something to something else in order to make a decision: When we weighed our decision against the alternatives, it was clearly the wrong choice.
2. To affect someone or something adversely in an evaluation: My poor test scores will weigh against me.