Focus on the pronunciation of guinea pig
English definition of “guinea pig”
/ˈgɪn·i ˌpɪg/ n [C]
› a small, furry animal with rounded ears, short legs, and no tail, often kept as a pet and for use in scientific experiments › fig. A guinea pig is also a person used in a test, esp. one to discover how effective a new drug or process is: Her own son accused her of having used him as a guinea pig to test her theories about the education of children.