Elephant in the room
Situation that everyone is aware of but no one wants to talk about
Hold your horses!
Wait a minute
Lucky dog
Lucky person
Watch like a hawk
Watch very closely
Fish out of water
Feeling out of place
Busy beaver
Someone who is very busy
Pig-headed
Stubborn
Cat got your tongue?
What you ask when someone is being quiet for no reason
Ducks in a row
Having everything organized
Something is fishy
Something is strange about a situation
Guinea pig
Test subject for something
You can lead a horse to water but you can't make it drink
You can prepare someone to do something but you can't make them do it
Let the cat out of the bag
Reveal a secret
The early bird gets the worm
The person who gets to a situation first is more likely to succeed
Big fish in a small pond
Someone who is important in a limited arena
People don't often change
Don't look a gift horse in the mouth
Don't refuse an opportunity or a gift that someone gives you
Cat's meow
Something good
Night Owl
Someone who is more productive at night
Crocodile tears
Fake crying
Monkeying around
Fooling or joking around
Get Your Goat
Someone/something annoying
It's difficult to add a new step to someone's routine
Happy as a lark
Someone who is very happy
The world is your oyster
You can do anything you put your mind to