If I say I'll be at a place come rain or shine, I mean that I can be relied on to turn up; nothing, not even the vagaries of British weather, will deter me or stop me from being there.
When someone is said to have 'come up trumps', they have completed an activity successfully or produced a good result, especially when they were not expected to.
If something comes with the territory, especially when undesirable, it is automatically included with something else, like a job, responsibility, etc.('Goes with the territory' is also used.)
It is the temperature range in which the body doesn't shiver or sweat, but has an idiomatic sense of a place where people feel comfortable, where they can avoid the worries of the world. It can be physical or mental.
A couch potato is an extremely idle or lazy person who chooses to spend most of their leisure time horizontal in front of the TV and eats a diet that is mainly junk food.
If a person said "I hate camping. I don't like giving up my creature comforts." the person would be referring, in particular, to the comfortable things he/she would have at home but not when camping. At home, for example, he/she would have complete shelter from the weather, a television, a nice comfortable warm bed, the ability to take a warm bath or shower, comfortable lounge chairs to relax in and so on. The person doesn't like giving up the material and psychological benefits of his/her normal life.
When people cross swords, they argue or dispute. This expression is used when some groups accuse each other for non-adherence to norms. Actually no sword is used but the tempo of the argument is high enough to cause worsening of the already bad situation. It is a tussle (vehement struggle without use of arms) between the parties to establish supremacy.
When you are crossing the Rubicon, you are passing a point of no return. After you do this thing, there is no way of turning around. The only way left is forward.
When people, companies, etc, have to make an important decision that will have a considerable effect on their future, it is crunch time.
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