Drop somebody in it
Definition 1 of 1
Pro Tip 1/3Colloquial Usage
The phrase is informal and best used in casual conversation, not in formal settings like business or written official communications. 
I won't drop you in it when she asks about the party, don't worry.
Pro Tip 2/3Negative Connotation
Using this phrase implies a negative outcome for someone, often due to sharing secretive or embarrassing information. 
By telling my boss about my lateness, you really dropped me in it.
Pro Tip 3/3Accidental Revelation
Sometimes people 'drop somebody in it' unintentionally by revealing something they didn’t realize was a secret. 
I didn't mean to drop you in it when I mentioned your surprise visit to his birthday.