The original meaning for the Greek word for “things that cause people to sin” is a trigger on which the bait is placed so that when an animal touches it the trap swings closed on its victim. Jesus is telling His disciples here that such sin is bound to happen in a world filled with depravity and wickedness, but deplorable and wretched is the person who would intentionally entice another to fall into such moral and spiritual ruin. So in other words, that person was the trigger of the trap…the cause of another’s stumbling… with devastating results for both.