The term 'collection of crows' is a metaphor for a large group of people, usually referring to a group of people who are gathered together in an intimidating or threatening manner. The crossword solution for this term is 'MURDER', which is a noun that refers to the unlawful killing of another human being. This term is often used to describe a large group of people who are gathered together in a menacing way, as if they were a MURDER of crows.