transitive. With object complement: to be certain that (a person or thing) is what is specified; (also) to show conclusively to be of a certain…

transitive. To form an opinion or estimate of (a person); (now) esp. to summarize the qualities or character of.

figurative. †to take measure(s), †to take a fair (also wrong, etc.) measure of: to form a fair (wrong, etc.) opinion or opinions (of) (obsolete). to…

colloquial (originally U.S.). Usually with up: To take the size or measure of; to regard so as to form an opinion of; to make an estimate of. Hence…

to weigh up: to appraise, form an estimate of (a person). colloquial.

With down: (a) To arrange in sizes downwards; (b) to size up; to comprehend.