1bean 
/ˈbi:n/ noun
plural beans /ˈbi:n/ noun [count] 1 a : a seed that is eaten as a vegetable and that comes from any one of many different kinds of climbing plants
▪ We ate rice and beans for dinner.
b : a part of a plant that contains very young seeds and that is eaten as a vegetable — see also green bean, pole bean, snap bean, string bean, wax bean
c : a plant that produces beans
▪ We're growing tomatoes and beans in our garden this year. 2 : a seed that looks like a bean but that does not come from a climbing plant
▪ coffee beans ▪ cocoa beans ▪ a vanilla bean — see also jelly bean, jumping bean
▪ We ate rice and beans for dinner.
b : a part of a plant that contains very young seeds and that is eaten as a vegetable — see also green bean, pole bean, snap bean, string bean, wax bean
c : a plant that produces beans
▪ We're growing tomatoes and beans in our garden this year.
▪ coffee beans ▪ cocoa beans ▪ a vanilla bean — see also jelly bean, jumping bean
a hill of beans — see hill
full of beans
informal 1 : full of energy and life
▪ We were young and full of beans. ▪ Although she's much older now, she's still full of beans. 2 US : not correct or truthful : full of nonsense
▪ If that's what he's been saying, then he's full of beans.
▪ We were young and full of beans. ▪ Although she's much older now, she's still full of beans.
▪ If that's what he's been saying, then he's full of beans.
not know beans about
US, informal : to not know anything about (something)
▪ He doesn't know beans about computers. [=he knows nothing about computers]
▪ He doesn't know beans about computers. [=he knows nothing about computers]
spill the beans
informal : to reveal secret information
▪ I tried to get him to tell me what he knew, but he refused to spill the beans.
▪ I tried to get him to tell me what he knew, but he refused to spill the beans.
