something (often something deceptively attractive) that catches you unawares

a small drum with two heads and a snare stretched across the lower head

a surgical instrument consisting of wire hoop that can be drawn tight around the base of polyps or small tumors to sever them; used especially in body cavities

strings stretched across the lower head of a snare drum; they make a rattling sound when the drum is hit

a trap for birds or small mammals; often has a slip noose