Idioms
on the ball
doing well
paying attention
easy as pie
pie is simple to make, so something like pie is easy to do
get cold feet
you're unsure of something right before you're about to do it
keep an eye on
cute as a button
something is very cute
in hot water
you're in trouble
on the money
correct
sick as a dog
you're very sick
that's the way the cookie crumbles
that is how something usually/customarily happens. It could be good or bad
piece of cake
something is easy
sleep like a baby
you slept very well
pull my leg
deceive or tease someone
skating on thin ice
you're in danger of getting in trouble
spread like wildfire
spread with great speed
your eyes are bigger than your stomach
you usually see food and believe you can eat it all, but you actually can't