Common idioms, easy to start with.
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a busy bee
A busy, active person who moves quickly from task to task
“She's A BUSY BEE”
a cat nap
A short sleep during the day
“I'm taking A CAT NAP”
a dead end
A situation with no hope of progress or development; a street with no exit
“That's A DEAD END job”
a frog in my throat
Unable to speak clearly because of a temporary throat problem
“Excuse me, I have A FROG IN MY THROAT”
a good deal
To a large extent, a lot
“It's A GOOD DEAL”
a great deal
To a very large extent
“It's A GREAT DEAL”
a little bird told me
I don't wish to divulge where I got the information
“A LITTLE BIRD TOLD ME”
a lot on one's plate
A lot to do
“I have A LOT ON MY PLATE”
a million and one
Very many
“There are A MILLION AND ONE things”
a penny saved is a penny earned
Every small amount helps to build one's savings
“A PENNY SAVED IS A PENNY EARNED”
a picture is worth a thousand words
A visual presentation can communicate something very effectively
“A PICTURE IS WORTH A THOUSAND WORDS”
a picture paints a thousand words
A visual presentation is far more descriptive than words
“You know what they say - A PICTURE PAINTS A THOUSAND WORDS”
a piece of cake
Something that is very easy to do
“That math test was A PIECE OF CAKE”
a rip off
Something that costs too much money; something that is overpriced
“That restaurant was A RIP OFF”
a scaredy-cat
Someone who is excessively scared or afraid
“Don't be A SCAREDY-CAT”
a sight for sore eyes
Someone that you're pleased to see
“You're A SIGHT FOR SORE EYES”
a steal
A fantastic bargain; something that costs much less than it's worth
“That car is A STEAL at that price”
a stone's throw
A very short distance
“It's just A STONE'S THROW away”
a taste of your own medicine
Something happens to you that you have done to someone else; experiencing the same treatment you've given others
“Now he's getting A TASTE OF HIS OWN MEDICINE”
about time
Far past the desired time
“It's ABOUT TIME”
about to
On the point of, occurring imminently
“I was ABOUT TO leave”
above and beyond
More than is expected or required
“She went ABOVE AND BEYOND”
ace
To do extremely well on something; to get a perfect score
“She ACED the exam”
across the board
In relation to all categories, for everyone
“Cuts are ACROSS THE BOARD”
actions speak louder than words
People's intentions can be judged better by what they do than what they say
“Don't just tell me you care - ACTIONS SPEAK LOUDER THAN WORDS”
add fuel to the fire
Worsen already existing tension
“Don't ADD FUEL TO THE FIRE”
against the clock
Forced to hurry to meet a deadline
“We're working AGAINST THE CLOCK”
agree to disagree
Accept or set aside a disagreement
“Let's AGREE TO DISAGREE”
ahead of the game
Making faster progress than anticipated
“Stay AHEAD OF THE GAME”
all ears
Listening willingly, waiting for an explanation
“I'm ALL EARS”