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I think we should invent an English word "forstay" :-) Or "forestay".

When I see such English words I cannot guess what do they mean. Conversely the word in the question is easily understandable because it was produced with regular word-formation rules from a...

"простой" has two meanings: as an adjective it means "simple", as a noun it means an interrupt in a work, time-out, idleness (from the same root as English "stay"). So "простойный" is an adjective of...