I'm going to crash now. I'm going to hit the sack. I'm going to cop some Z's.
No, "hit the hay" is an idiom that means to go to bed or go to sleep. It is not a metaphor, as it is a commonly used phrase with a specific meaning that is understood by native English speakers.
Yes because you are not literally hitting a sack.
death is not a bed of tulips?
Idiom
It means that one company is secretly dealing with another one. The mental image is of two people having an affair.
Bivouac bed is called a cot. Cots are used in place of a bed or as an extra bed. They are familiar when you go to hotels and have an extra guest.
In English, the idiom is "in bed". There's a subtle distinction in that people tend to use "in bed" to mean "lying down, under the covers" (and thus technically "in" the bedding), but will say "on [someone's] bed" when they mean sitting on top of the covers.
No, the idiom is only used to refer to rain.
This idiom, and the associated "wake up with the cows", means to go to bed early in the evening, so as to get good rest durign each night's sleep (and similarly, to wake up early, to utilise the daylight available instead of sleeping). It derives from a time when farming was dependent on being able to see what was going on. Chickens would go to bed around dusk; because there was little to do after this time, the farmer may as well sleep at this time too. Likewise, waking up when the cows do (around dawn) meant that the maximum of daylight could be used; the cows would also need milking at that time, so it was doubly a good idea.
The abbreviation of GTB is used commonly when talking online. This term is short for go to bed or going to bed.
The figure of speech used in this sentence is known as an idiom. In this case, "go fly a kite" is a common idiom that means to dismiss someone or to tell them to go away. It is a polite way of refusing a request or ignoring someone's demands.
its to go to bed