impasse (n.)
- bar
- barrier
- block
- blockade
- blockage
- bottleneck
- box
- cecum
- choking
- clog
- congestion
- constipation
- corner
- deadlock
- dilemma
- embolism
- embolus
- extremity
- fix
- gorge
- halt
- hole
- impediment
- infarct
- infarction
- jam
- obstacle
- obstipation
- obstruction
- pickle
- plight
- scrape
- stalemate
- stand
- standstill
- stop
- stoppage
- strangulation
