i Register
In some senses, deathtrap is marked as figuratively, informal. Watch for register when choosing this word.
noun
An extremely dangerous location, structure, or device.
Route 9 is a deathtrap; they should at least put up guard rails.
Dude, your car is a deathtrap! Get the brakes and the steering fixed.
A plot device where a villain in a story puts a hero in an elaborate dangerous situation for the purposes of attempting a sadistic murder.