"to be on the ball" means
to be alert
to be on the top
to be funny
"a piece of cake" describes something
very easy
very sweet
very fun
"to beat around the bush" means
to avoid talking about something
to take a long time do something
to show disagreement about something
"to be left out in the cold" means
to be excluded
to be freezing
to be alone
"to cost an arm and a leg" means
something cheap
something expensive
something of low quality
"Once in a blue moon" means
never
rarely
usually
"to pull someone's leg" means
to make someone uncomfortable or anxious
to make someone happy about something
to fool someone
"to skate on thin ice" means
to do something challenging
to be in a risky situation
not to like something you have to do
"as clear as mud" means
something confusing
something brown
something obvious
"to put your feet up" means
to relax
to be clumsy
to be tired
"to take the plunge" means
to fall down (from a very high place)
to commit to a decision (often one that makes you nervous)
to make a choice (especially between two similar options)
Break a leg!
Have fun!
Well done!
Good luck!
"to be under the weather" means
to be strong
to be sad
to be ill
It rings a bell!
I want to get attention
something sounds familiar
It makes a lot of noise
"to speak of the devil" means that
you have an uncomfortable conversation
the person who you were talking about unexpectedly arrives
you talk about a person you don't like
"to give the green light" means
to like something
to allow something
to forbid something
"to get cold feet" means
suddenly change your emotion eg. from happy to sad
o be anxious about something
to change your mind about something because you are nervous