Idioms

1)	Sign in a hotel: Please ring the bell for service.

2)	A:	'Do you know Mike Davies?'
	B:	'Mike Davies? The name rings a bell.'

3)	You'll need to get some boots if you're going to Canada in the winter or you'll get 	cold feet.

4)	She had planned to go travelling in Africa for six months but at the last minute 	she got cold feet and cancelled the whole thing.

Which of the above sentences contain idioms?
Underline them and discuss their meaning with your partner.
If you could not guess the meaning of these idioms, where would you start looking in the dictionary?

Write a short definition for the word 'idiom' here and write down any words in the same word family: (e.g. economy, economics, economist, economize)