C

Cake Walk: (something that is very easy or efortless)

• In states and localities across America, good times are making for reelection cakewalks. 
• It's no cakewalk to raise a family on two part-time salaries, even for a little while   

Call it a day:

Charade: 

• (an absurd pretense intended to create a pleasant oscary, r respectable appearance) Talk of unity was nothing more than a charade 
• (an empty or deceptive act or pretense) His concern was a charade

Chest-thumping:

Chicken out:

Chilling look: (Intimidating, scary, cold, unfriendly) 

• "The suspect gave the detective a chilling look before being led away," (implies a threatening or menacing stare).
• "She gave me a chilling, silent stare that made me immediately stop talking," (implies a cold, icy, and intimidating look). 

Conjectures: (an opinion or conclusion formed based on incomplete information)

Cut it out: 

• (to stop doing what one is doing) That hurts! Cut it out!
• If you're fooling around or smoking old banana peels, you'd better cut it out.
• If so, he dhould cut it out.