bar barrier blank blank wall blind blind alley blind gut blind-alley block blockade blockage bottleneck box cecal cecum choked choked off choking choking off clog closed congestion constipation constricted contracted corner costiveness cul-de-sac dead dead-end street deadlock embolism embolus extremity gorge halt hole impasse impediment infarct infarction jam obstacle obstipation obstruction pocket sealing off shut squeezed shut stalemate stand standstill stop stoppage strangulated strangulation unopen unopened unvented unventilated