It is impossible to get something from someone if they don't have it, just as you cannot get blood from a turnip.
Fall off the turnip truck
(USA) If someone has just fallen off the turnip truck, they are uninformed, naive and gullible. (Often used in the negative)
Squeeze blood out of a turnip
(USA) When people say that you can't squeeze blood out of a turnip, it means that you cannot get something from a person, especially money, that they don't have.
An turnip idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with turnip, allowing users to choose the best word for their specific context.
Dicionário de palavras semelhantes, Diferentes palavras, Sinônimos, Expressões idiomáticas para Idioma turnip