Similes
To know something like the back of your hand
to know something very well
I racked my brain all morning
To work hard to think of a solution to a difficult problem
Knock on wood
to cancel bad luck; don't jinx it
Better late than never
It's better to finish something late, than to never do it at all
Run like the wind
to run very quickly
He is a night owl
likes to stay up late
to accept responsibility for your actions
All good things must come to an end
everything ends, some good things don't last forever
Like watching grass grow
very boring
Life is a rollercoaster
life has its ups and downs, good things and bad things
I heard it through the grapevine
to hear something by rumor or gossip
Laughter is the best medicine
When you're in a difficult situation, laughter can make it easier to get through the situation.
As light as a feather
something weighs very little
The computers at school are dinosaurs
old and outdated
Hit the jackpot
to win or to be very lucky
Early bird gets the worm
If you get a head start on things, you'll probably get what you want.
As cheap as dirt or "dirt cheap"
something is inexpensive
He is a walking dictionary
to know a lot of information, to be very smart
A penny for your thoughts
A way of asking what something is thinking
Two wrongs don't make a right
Trying to get revenge on someone who has hurt you will only make things worse