- He dresses decently, yet he seldom has a guinea at command.
- He was used as a guinea pig for the new drug.
- You want to be a guinea pig man?
- This site is used as a guinea pig.
- He was used as a guinea pigfor the new drug.
- If he pays a guinea to that society, the will expect them to grant him considerable privileges; he's throwing a sprat to catch a whale.