Valley-of-death definitions

(idiomatic) Death; or a place or period where death is impending.
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(idiomatic) A place of great danger.
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(idiomatic, business) The phase of a startup business beginning with the entrepreneur's fulltime commitment to it and ending when the business has achieved sustainable cash flow.
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Origin of valley-of-death

Probably derived from the Old Testament, Psalm 23 valley of the shadow of death.