know (one's) beans



know (one's) beans

To be knowledgable about and/or very familiar with something. I had no idea you were such a good piano player—you really know your beans!
See also: bean, know

Common Names:

NameGenderPronouncedUsage
Cotton['kɔtn]
Marylamah-RI-lahPolish
Tesni-Welsh
Dima (2)DEE-mahRussian
Eigyr-Welsh Mythology
ÁBelAH-bel Hungarian