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