Burn one's fingers

Burn the candle at both ends

Burn the midnight oil

Burn up

Burst at the seams

Burst in on (someone or something)

Burst into flames

Burst into tears

Burst onto the scene

Burst out laughing

Burst with joy

Burst with pride

Bury the hatchet

Bury/hide one's head in the sand

Business as usual

Busman's holiday

Bust a gut (to do something)

But for (someone or something)

Butt heads with (someone)

Butt in (on someone or something)

Butter (someone) up

Button one's lip

Buy (something) for a song

Buy (something) on credit

Buy (something) sight unseen

Buy a pig in a poke

Buy a stake in (something)

Buy off (someone)

Buy out (someone or something)

By a hair's breadth

By a long shot

By a mile

By a whisker

By a whisker/hair

By all accounts

By all appearances

By all means

By and by

By and large

By any means

By chance

By check

By fair means or foul

By far

By fits and starts

By hook or by crook

By leaps and bounds

By means of

By no means

By shank's mare

By the book

By the day

By the dozen

By the dozens

By the handful

By the hour

By the month

By the same token

By the seat of one's pants

By the skin of one's teeth

By the sweat of one's brow

By the way

By the week

By the year

By virtue of (something)

By way of (something or somewhere)

By way of (something)

By word of mouth

BYOB

C

C/O

CA

Calculated risk

Call (someone or something) into question

Call (someone) in

Call (someone) names

Call (someone) on the carpet

Call (something) in

Call a meeting

Call a meeting to order

Call a spade a spade

Call for (someone or something)

Call for (someone)

Call it a day/night

Call it quits

Call of nature

Call off (something)

Call on (someone)

Call out to (someone)

Call someone's bluff

Call the dogs off

Call the roll

Call the shots

Call up (someone)

Calm down

Can of worms

Can take (something) to the bank

Can't do anything with (someone or something)

Can't see beyond the end of one's nose

Can't see the forest for the trees

Can't stand (someone or something)

Can't stand/stomach (someone or something)

Can't stomach (someone or something)

Cancel (something) out

Cannot see one's hand in front of one's face

Cap and gown

Captain of industry

Card up one's sleeve

Cards are stacked against (someone)

Carried away

Carrot and stick

Carry (something) out

Carry a lot of weight with (someone or something)

Carry a motion

Carry coals to Newcastle

Carry on

Carry one's (own) weight

Carry over (something)

Carry over figures/numbers/costs

Carry the ball

Carry the day

Carry the torch

Carry the weight of the world on one's shoulders

Carry through with (something)

Carte blanche

Case in point

Case of mistaken identity

Cash cow

Cash in (something)

Cash in on (something)

Cash in one's chips

Cash on the barrelhead

Cash-and-carry

Cast a (critical/professional) eye over (someone or something)

Cast an eye over (something)

Cast around/about for (someone or something)

Cast aspersions on (someone)

Cast doubt on (someone or something)

Cast doubts on (someone or something)

Cast in the same mold

Cast one's lot in with (someone)

Cast one's vote

Cast pearls before swine

Cast the first stone

Castles in the air

Cat burglar

Cat gets one's tongue

Cat nap

Cat on a hot tin roof

Catch (someone's) eye

Catch (someone) in the act of (doing something)

Catch (someone) napping

Catch (someone) off balance

Catch (someone) off guard

Catch (someone) red-handed

Catch (someone) with their pants down

Catch a cold

Catch fire

Catch forty winks

Catch on

Catch one's breath

Catch one's death of cold

Catch sight of (someone or something)

Catch some Z's

Catch up to (someone or something)

Catch up with (someone or something)

Catch-22

Catch-as-catch-can

Caught in the middle/cross fire

Caught short