an unstable construction with playing cards; "he built three levels of his cardcastle before it collapsed"
a speculative scheme that depends on unstable factors that the planner cannot control; "his proposal was nothing but a house of cards"; "a real estate bubble"
pressing importance requiring speedy action; "the urgency of his need"
an urgent situation calling for prompt action; "I'll be there, barring any urgencies"; "they departed hurriedly because of some great urgency in their affairs"
the state of being urgent; an earnest and insistent necessity