1. To get into a bad or dangerous situation. I think we might get into trouble if we try driving the car on that rickety bridge. If you ever get into trouble out in the water, wave both your arms so the lifeguard can see you.

2. To be reprimanded for something. I am definitely going to get into trouble with my mom if she finds out that I broke the vase. If I'm not home by curfew, I will get into trouble with my parents.

3. To get a woman pregnant outside of marriage. In this usage, a noun or pronoun is used between "get" and "into." You're just 16 years old—if you aren't ready to raise a baby, then you better not do anything to get a girl into trouble.