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Related to weigh up: scale up
1. To measure the weight of something. A noun or pronoun can be used between "weigh" and "up." Let me weigh up that produce for you. The explorers weighed up the treasure they had found.
2. To gauge the potential benefits or downsides of something. A noun or pronoun can be used between "weigh" and "up." We really need to weigh up our options here. I've weighed up all the pros and cons, and I think this is still the best phone for what I need.
3. To attempt to determine someone's strength, intelligence, skill, integrity, etc. A noun or pronoun can be used between "weigh" and "up." I could tell everyone was weighing me up when I walked into the office for the first time. The boxer silently weighed her opponent up from across the room.
weigh something up
to find out the weight of something. I can't tell you how much this will cost until I weigh it up. Liz weighed up the meat and jotted down the price.