please explain these in english

[pimppounds@yahoo.co.uk]

1. Having a feather brain. 2. Being chicken hearted. 3. Stop begging the question. 4. A bird of passage. 5. To be a life wire. 6. Taking with a grain of salt.

All these are Idiomatic expression. kindly explain all this question or idiomatic sentences.

[Anglika]

Are these an assignment? Have you looked at this: http://www.usingenglish.com/reference/idioms/