a little bit of bread and no cheese

a little bird told me

I received the information from a source which I am not prepared to disclose.

a little from column A, a little from column B

A combination of two factors or reasons.

a little of something goes a long way

Only a small amount of something is usually required to produce a great effect.

best thing since sliced bread

Alternative form of greatest thing since sliced bread.

big cheese

A very important figure, especially a high-ranking person in an organization.

bit by a barn mouse

tipsy; slightly drunk

bread and butter

That which is central or fundamental, as to one's business, survival, or income; a staple or cornerstone.

bread and circuses

Food and entertainment provided by the state, particularly if intended to placate the people.