Let (someone or oneself) in for idiom
If you let someone or yourself in for something, you bring or get someone or yourself involved in a situation that is dangerous, bad distasteful or horrifying.
Do you know what you let yourself in for, John? This is a war, not a game.
Martin let himself in for the boxing fight without knowing that his competitor could knock him to the ground very easily.
What did you let her in for, Jeff? How could she invest in that when she had absolutely no knowledge of finance?
Used to say that someone is so involved in a difficult situation that he/she cannot get out of.
1. To become closely involved in a specific situation.
2. To make something or a situation worse.
To have no participation in doing something.
1. To meddle with something.
2. To threaten someone.
3. To mock or try to deceive someone.
4. To take part in a dangerous thing or situation.
To involve oneself into something that is none of one's business or responsiblity