bit by a barn mouse

a little bit of bread and no cheese

Used to represent the song of the yellowhammer (Emberiza citrinella).

barn find

A valuable item recovered from poor storage, such as a suburban garage, farm shed, etc., where it had been more or less forgotten; especially a vintage automobile.

born in a barn

In a past tense: criticizing the person to whom the phrase is directed for inappropriately, and usually neglectingly, leaving an exterior door or window open, considered ill-mannered.

champ at the bit

To show impatience or frustration when delayed.

dust mouse

A dust bunny.

every bit

Exactly, to its full degree

not be able to hit the broad side of a barn

To have very poor aim, such as while using firearms or in sports.

pony in the barn

An exciting and real prospect, something to be legitimately excited about.