To cost an arm and a leg
Something cheap
something expensive
Something of low quality
To ring a bell
Something that sounds familiar
Something that makes a lot of noise
To get attention
To skate on thin ice
to do something challeging
to not like something you have to do
to be in a risky situation
'A piece of cake' to describe something
very easy
very sweet
very funny
To beat around the bush
to show disagreement about something
to avoid talking about something
to take a long time to do something
To get cold feet
suddenly change your mind about sth because yo're nervous
to not have luck
suddenly change your emotion eg: happy to sad
To bite a bullet
to do something that makes someone else uncomfortable
to do something that makes you nervous
to make yourself do something difficult or unpleasant
As clear as mud
something obvious
something brown
something confusing
Once in a blue moon
rarely
never
usually