1. (n.) Sudden or unexpected appearance; an unforeseen occurrence; a sudden occasion.

2. (n.) An unforeseen occurrence or combination of circumstances which calls for immediate action or remedy; pressing necessity; exigency.

X ray blood bank breakers ahead cardhouse cause for alarm charity ward climacteric clinic clutch consultation room contingency convergence of events crisis critical juncture critical point crossroads crucial period crunch danger dangerous ground delivery room difficulty dispensary endangerment examining room exigency extremity fever ward gaping chasm gathering clouds hazard high pressure hinge hospital room house of cards imperativeness imperilment intensive care isolation jeopardy labor room laboratory maternity ward menace nursery operating room pass peril pharmacy pinch plight predicament press pressure prison ward private room push quicksand recovery room risk rocks ahead rub semi-private room storm clouds strait stress surgery tension therapy thin ice threat treatment room turn turn of events turning turning point urgency ward