Weigh is a verb that means to measure the weight or heaviness of something.
When you need to know how heavy your luggage is before getting on a plane, you weigh it. You might use a scale for this. We also talk about weighing ourselves regularly to keep track of our body weight and make sure we're not gaining too much. Some people even weigh their food portions when they're trying to eat healthy by counting calories.
How common is "weigh"?
Word weigh is considered uncommon in modern English. It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions
verb
To determine the weight of an object.
Often with "out", to measure a certain amount of something by its weight, e.g. for sale.
Example: He weighed out two kilos of oranges for a client.
To determine the intrinsic value or merit of an object, to evaluate.
Example: You have been weighed in the balance and found wanting.
To judge; to estimate.
To consider a subject.
To have a certain weight.
Example: I weigh ten and a half stone.
To have weight; to be heavy; to press down.
To be considered as important; to have weight in the intellectual balance.
To raise an anchor free of the seabed.
To weigh anchor.
To bear up; to raise; to lift into the air; to swing up.