Milking The Cow

Usually a reference to treating a person or entity as a cash cow. This implies taking advantage of a situation and has a strongly negative tone (except to those happily taking the money). Ex.: "Defense contractors get hugely inflated contracts from the government. They're really milking the cow - and making the rest of us pay for it." (An example of the issue)

A Cash Cow

 A "cash cow" is a source of steady income. Ex.: "Before the housing bubble collapsed, mortgages were a cash cow for banks and investors alike." That is, until the recent economic troubles, mortgages were a steady source of profit (even though that was a "bubble" effect).

Get Over It

To "get over" something is to move beyond it; to leave it in the past. Conversely, to not "get over" something is to dwell on it and keep it alive as an issue. Ex.: "Your party lost in the last election. Get over it!" This is insensitive, but means, accept defeat with grace; do not be a sore loser.

Seeing Eye To Eye

To see "eye to eye" with another person is to be in complete, total agreement about a particular subject. Ex.: "Lisa's father and mother both saw eye to eye about her new boyfriend: they both thought he was no good for her at all." (Here, the idiom is in the past tense. Seeing -> Saw)

Cool as a Cucumber

A cucumber is a gourd that is usually stored cold in a fridge (in the West, anyway). Thus, to be "cool as a cucumber" is to be very cool; that is, level-headed, even-tempered, in strong command of oneself. Ex.: "You've already done one TV interview. You'll be cool as a cucumber in the next one!"

Flipped On Its Head

Something "flipped on its head" has been figuratively turned upside down. It has been altered so profoundly that up is down, left is right, and a person's expectations have been completely overwhelmed. Ex.: "Social media has turned the communications business on its head." Social media has revolutionized the communications business.

In The Heart Of

The "heart" of something is its center, its core, its most vital area. This can be figurative, or in relation to territory, it can be geographic in nature. Ex.: "Protesters set fire to at least three police cars in different parts of the city, including one in the heart of the financial district." (Subject: G20 riots) This means, in the center/ the core of the financial district (of Toronto, in this case).