take one look (at someone or something)

take one look (at someone or something)

To scrutinize someone or something very quickly and cavalierly. Typically used to preface some conclusion or judgment made about the person or thing being The coach took one look at me and said I was way too scrawny to be on the football team. We took one look at that house and walked right back out again—what a dump!
See also: look, one, someone, take