|ants in one's pants
||unable to sit still or remain calm out of nervousness or excitement
||Lisa had ants in her pants the day before her interview.
|(the) birds and the bees
||I learned about the birds and the bees when my baby brother was born.
||a short sleep
||I'm going to have a cat nap while you're cooking dinner.
|cat's got one's tongue
||said about someone who doesn't speak (usually due to shyness)
||It looks like the cat's got your tongue, Lucy. Are you always this quiet?
||to decide not to do something out of fear (usually just before)
||I was going to take a ride on Geoff's motorcyle, but I chickened out when he gave me a helmet to wear.
||become quiet suddenly
||Arthur clammed up when I asked him about his family.
||a person who does the same thing as someone else
||My sister is such a copy cat. First she bought the same car as me, and now she's applying to my school.
||very hot days
||I sleep in the basement during the dog days of August.
|dropping like flies
||dying/giving up quickly
||My roses are dropping like flies in this early frost.
||a person who is excited about doing certain work
||Ever since he got his new drill set my husband has been an eager beaver around the house.
||I knew something fishy was going on when I saw all of my friends' cars in my mom's driveway.
|have a cow
||get extremely upset (often over something minor)
||My teacher had a cow when she realized nobody had done the homework.
|hold your horses
||wait and be patient
||Hold your horses! I'll be done in the washroom in a minute.
||Wow, I'm surprised!
||Holy cow! I can't believe you ate everything on your plate.
||If you're going to horse around, please go outside.
|get the lion's share
||get the greatest percentage
||My aunt got the lion's share of the inheritance.
|in the dog house
||in trouble with another person
||I don't think Marsha is coming out tonight. She's still in the dog house for forgetting Aaron's birthday.
|kill two birds with one stone
||get two things done at once
||If you pick the groceries up when you drop George off for his shift, you will kill two birds with one stone.
||The gas station is kitty corner to the library.
|let the cat out of the bag
||reveal a secret
||Who let the cat out of the bag about the surprise party?
|(a) little bird told me
||I heard something (usually secretive or unknown) from someone (not named)
||A little bird told me that you are thinking of quitting your job.
|make a beeline
||go straight for something
||My grandma made a beeline for the smoking room as soon as she got off the airplane.
|monkey see, monkey do
||silly/unintelligent people tend to copy each other's actions
||Our one-year-old is saying bad words now. I told my husband, "Monkey see, monkey do!"
||money saved for the future
||We have a nest egg that we might have to use if Jim goes on sick leave.
||eat a lot of something
||I pigged out on pancakes so I don't have room for lunch.
|raining cats and dogs
||I forgot my umbrella, and it was raining cats and dogs.
||fierce, competitive struggle for power, position etc
||I'm ready to leave this rat race and retire in Mexico.
|smell a rat
||begin to suspect trickery etc
||I asked my brothers not to tell my parents that I went out, but I could smell a rat as soon as I opened the door.
|straight from the horse's mouth
||directly from the original source
||I know Jenny is pregnant, because I heard it straight from the horse's mouth.
|take the bull by the horns
||face a challenge or danger boldly
||If you really think you deserve a promotion, you'll have to take the bull by the horns.
|until the cows come home
||for a very long time
||I could eat pizza and ice-cream until the cows come home.