a one-way ticket to (something)

if something is a one-way ticket to an unpleasant situation, it will cause that situation to happen.

A rejection of the peace deal would be a one-way ticket to disaster for the country.

Experimenting with drugs is a one-way ticket to addiction and misery, as far as I'm concerned.

• a camp follower
• a can of worms
• a carbon copy
• a carrot and stick
• a carrot and stick approach
• a carrot-top
• a case in point
• a cash cow
• a cat and mouse game
• a cattle market
• a cause celebre
• accept as gospel
• accept as gospel truth
• accept something as gospel
• accept something as gospel truth
• accidentally on purpose
• accidents will happen
• account for
• account for something
• a change of heart
• a change of pace
• a charley horse
• a cheap shot
• a chef d'oeuvre
• ache for