A piece/slice of the action, tortuous, torturous

Cameron takes the reins

Conservative Party leader David Cameron completed a tortuous journey to become Britain's prime minister, and essentially clinched a fragile power-sharing deal with the country's No. 3 political party.

Losing someone you love is a torturous experience.


a piece/slice of the action INFORMAL
a piece [slice] of action　〔話〕 利益の分け前.
involvement in something successful that someone else has started:
Now research has proved that the drug is effective everyone wants a slice of the action.

A piece of the action

Meaning
A share in an activity, or in its profits.
Origin
'A piece of the action' has an unambiguously American flavour. It brings to mind images of gangster movies with Jimmy Cagney and the like demanding 'hey, gimme a pieca da action'. When the Star Trek franchise opted for a mobster themed episode in 1968 they called it 'A Piece of the Action'. It isn't essentially a US phrase though and tracing its genesis takes us well outside the USA and into a history of finance.
In the early 1600s, the Dutch came upon an interesting trading innovation - the company. Until then, the spice trade had been profitable but small scale, with spices being brought back from 'the Indies' (broadly what we now call Asia) along the tortuous Spice Road on pack horses. The high price of spices encouraged entrepreneurs to build ships to bring the spices back in larger quantities. There was big money to be made, but the large capital cost of building a fleet and the threat of loss from pirates made it too risky a venture for an individual investor; so, in 1602, they formed a company - the Dutch East India Company.
Dutch citizens were invited to invest in the company, which had been given exclusive trading rights to half the world and tax-free status back home. Profits were huge and the clamour to invest was intense. Dirck Bas Jacobsz, one of the company's founders, was instrumental in managing the joint ownership by offering what were then called in Dutch 'acties' or, in English, 'actions'. These were certificates that promised a share in any future profits of the company and what, not unnaturally, came later to be called share certificates. These shares were often purchased by groups rather than individuals. What each of these good citizens had bought was literally 'a piece of the action'.
The term 'action', which continued to be used in that context well into the 19th century, was first recorded in English in John Evelyn's Diary, published between 1641 and 1706:

"African Actions fell to £30, and the India to £80."

'A piece of the action' is certainly a 20th century American phrase. Despite its 1930s mobster overtones, the first use of it that I can find is in the 1957 film Monkey on My Back:

"You want a piece of my action, Sam?"

The 'action' in the phrase means 'a share in an activity; an opportunity'. It is doubtful that whoever coined it in 1950s America knew the history of the Dutch East Indies Company but, knowingly or not, it was the Dutch 'acties' that were the source of that meaning of 'action'.

torturous

Pronunciation: /ˈtɔːtʃ(ə)rəs/

Definition of torturous

adjective

• characterized by, involving, or causing pain or suffering:a torturous five days of fitness training

Derivatives

torturously

adverb

a torturously hot day

Origin:

late 15th century: from Anglo-Norman French, from torture 'torture'

tor·tu·ous (tôr'chū-əs) adj.

1. Having or marked by repeated turns or bends; winding or twisting: a tortuous road through the mountains.
2. Not straightforward; circuitous; devious: a tortuous plot; tortuous reasoning.
3. Highly involved; complex: tortuous legal procedures.

[Middle English, from Anglo-Norman, from Latin tortuōsus, from tortus, a twisting, from past participle of torquēre, to twist.]

[形]

1 〈道・流れなどが〉曲がりくねった, ねじれた.

2 〈文章・発言などが〉長くて複雑な；率直でない, 回りくどい.

3 〈手段・政策などが〉不正な, よこしまな.

tortuously tor'tu·ous·ly adv.
tortuousness tor'tu·ous·ness n.

USAGE NOTE Although tortuous and torturous both come from the Latin word torquēre, "to twist," their primary meanings are distinct. Tortuous means "twisting" (a tortuous road) or by extension "complex" or "devious." Torturous refers primarily to torture and the pain associated with it. However, torturous also can be used in the sense of "twisted" or "strained," and tortured is an even stronger synonym: tortured reasoning.