"to give the green light"
to prohibit something
to like something
to allow something
"to ring a bell"
something that makes a lot of noise
something sounds familiar
to get attention
"to skate on thin ice"
to do something challenging
to not like something you have to do
to be in a risky situation
"as clear as mud"
something obvious
something confusing
something brown
"it's not rocket science"
it's really difficult
try the experiment again
it's not complicated
"to be left out in the cold"
to be excluded
to be freezing cold
to be alone
"a piece of cake"
very sweet
very fun
very easy
"hit the sack" / "hit the hay"
visit a farm
get up
go to bed
"to beat around the bush"
to avoid talking about something
to show disagreement about something
to take a long time do something
"to pull someone's leg"
to fool/ play a joke on someone
to make someone happy about something
to make someone uncomfortable or anxious
"break a leg!"
good luck!
well done!
have fun!
"to put your feet up"
to be clumsy
to be tired
to relax
"to cost an arm and a leg"
something cheap
something expensive
something of low quality
"to be under the weather"
to be strong
to be ill
to be unhappy
"to get cold feet"
suddenly change your emotion eg: happy to sad
to be anxious about something
suddenly change your mind about sth because you are nervous
"to be on the ball"
to be funny
to be alert
to be on the top
"once in a blue moon"
usually
rarely
never
"go back to the drawing board"
start again
ask for advice
draw a picture