It can mean many things. You can "get down to" something, which means you can settle in and get started. You can be "down to earth," which means you're sensible and practical. We really need to know the rest of the phrase in order to define it properly.
No, Up does not mean down. In fact, "down" is the antonym of "up"!
Please clarify what is step down mean ? or did you mean bow down?
Down These Mean Streets was created in 1967.
you mean what you mean
falls down or breaks down
Probably; I am not sure what you mean. Perhaps you mean "I sit down".
It means to back down or calm down
Spelled-down, which should be hyphenated would mean defeated in a Spelling Bee. The phrase is rarely used at present. Down spelled down, that can mean anything, perhaps a novel title. ( often novel titles are indeed novel, and are difficult to figure out!)
If you mean then it could be something like: I'll walk down the aisle of the church. If you mean ill, then it could be something: The bride was feeling ill as she walked down the aisle.
What do you mean by come down?
I think you mean slow down and speed up. slow down =slow, speed up=fast
alight