eavsing
You stick your ear where it doesn't belong, just so you can hear what others are saying and maybe throw in your two cents if they ask.
I stuck my ear near the bathroom stall and heard my friend talking about me. I didn't say anything because I was scared.
I eavsed on my mom and dad and heard them argue about my grades. I pretended I was just doing my homework.
I eavsed on my teacher and heard him say I was the worst student he ever had. I said nothing because I was too scared.