Noun

1. Something (often something deceptively attractive) that catches you unawares
2. A small drum with two heads and a snare stretched across the lower head
3. 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
4. Strings stretched across the lower head of a snare drum; they make a rattling sound when the drum is hit
5. A trap for birds or small mammals; often has a slip noose

Verb

1. Catch in or as if in a trap
2. Entice and trap