Few more Idioms..

1. To do away with - get rid of, to abolish 
2. Be laid -up :- be forced to stay in bed by illness etc. 
3. To run up with :- to meet by chance . 
4. By leaps and bounds:- rapidly. 
5. In cold blood:- mercilessly. 
6.Blood and iron:- relentless use of force. 
7. Bad blood :- ill feeling. 
8. To spread like wild fire:- to spread very quickly. 
9. At sixes and sevens :- in confusion. 
10. A bolt from the blue :- completely surprising.
11. To show tears and frays:- come out in loose threads 
12. To wear one's feet out :- to walk a lot 
13. To trigger off :- be immediate cause of something serious or 
      violent. 
14. Be responsible for:- cause
15. Cock and bull story :- Incredible story.
                                     Collected by  Rakhi .B. Nair, XII B