Meaning:
a bit 
adv.
to a small degree; somewhat
bi Idiom, Proverb
a big rig
a big truck, a semi-trailer truck Do you have a driver's license? Have you ever driven a big rig?
a big shot
an important person, a boss, a big wheel On payday he spends money like a big shot, buying drinks for all.
a big wheel
a person with power, a big shot Bing has been acting like a big wheel since he got promoted.
a big wig
an important person, a president etc., VIP Barry is a big wig in Gulf Oil - a vice president or something.
a bird in the hand is worth two in the bush
having one is better than seeing many When searching for a better job, remember A bird in the hand... .
a bit at sea
a bit unsure, uncertain He seems a bit at sea since his brother died. They were close.
a bit off/a bit mental
not rational, unbalanced, one brick short Kate talks to the birds. Do you think she's a bit off?
a bitch
a complaining woman, a woman who nags What a bitch! She complains to us and criticizes her kids.
a bite to eat
a lunch, a snack We can grab a bite to eat at the arena. They sell snacks there.
a bitter pill
a negative event, a loss, a painful experience Divorce is a bitter pill for her. She believed in her marriage.
a clean bill of health
a good report from the doctor, a good checkup You'll never get a clean bill of health if you eat fat meat!
a little bird told me
someone told me, one of your friends told me """How did you know that I play chess?"" ""Oh, a little bird told me."""
a nail-biter
"exciting game or movie; having much suspense" Have you seen the movie The Fugitive? It's a nail-biter.
bark is worse than his bite
"he sounds angry but he is not; do not be afraid of him" Baxter sounds mad, but his bark is worse than his bite.
bide one
patiently wait for an opportunity to occur. He is biding his time as he waits to become president of the company.
biff/biffy
washroom, bathroom, the can, the john, the loo """Is there a biffy on the bus?"" ""Yes. There, at the back."""
Big Apple
(See The Big Apple)
big boys
powerful men in business, moguls, big shots If you want to do business with the big boys, you need money.
big break
big chance, a lucky break She got her big break when a talent scout heard her sing.
big bucks
a lot of money, a high price You'll pay big bucks to rent an apartment near the university.
big cheese
an important person, a leader He is a big cheese in his company so you should be very nice to him.
big deal
important event, major happening A small fire is a big deal because it can cause a lot of damage.
big fish in a small pond
an important person in a small place He wasn
Big Foot
"a large ape-man living in the forests of western N. America; Big Foot" Gary told me he saw Big Foot's tracks in the sand beside the Kootenay River.
big gun/cheese/wheel/wig
an important person, a leader The new director was a big wheel in his previous company but is not so important now.
big head
too high an opinion of one's own ability or importance, conceit He has a big head since he won the speech contest at university.
big mouth
someone who talks too loud, loud mouth Every crowd has a big mouth - some guy who yells at the cops.
big picture
(See the big picture)
big rig
(See a big rig)
big shot
rich or important person, VIP, big boys Randy's a big shot in the movie industry. He owns four studios.
big time
a lot, very much, heavy duty You've helped me so much. I owe you big time.
big wheel
(See a big wheel)
big wigs
important persons: judges, presidents etc., VIP We've asked the big wigs to change their decision.
bigger fish to fry
more important people to meet or do business with Don't bother fighting with him. You've got bigger fish to fry.
bigger than life
"heroic: stronger, wiser, uglier; larger than life" The characters in most novels seem to be bigger than life.
bigger they are...
(See the bigger they are...)
billy dog
(See a billy dog)
bimbo
foolish girl, an airhead Don't call any girl a bimbo, please.
bird in the hand is worth two in the bush
one shouldn
birdbrain
a person with a tiny brain, dumbo Hey, birdbrain. Why are you throwing money in the river?
birder
a bird watcher, one whose hobby is watching birds Some birders were looking at an oriole in a poplar tree.
birds and bees
the facts about sex and birth He learned about the birds and bees in his health education class at school.
birds-eye view
a general view from above Let
birds of a feather flock together
people who are similar become friends or join together Don
birthday suit
completely naked, no clothes on The little boy was running down the street in his birthday suit.
bit by bit
doing a small amount each time, little by little Bit by bit, they rebuilt a church that was destroyed by bombs.
bit off
(See a bit off)
bitch
complain, grouse He tells me I'm always bitching, but I don't complain very much.(See a bitch)
bite me
I have no respect for you, kiss off, blow me """Bite me! Take your list of whores and live with them!"""
bite off more than one can chew
take responsibility for more than one can