1. I know about the surprise party you guys are throwing me today. Jerry let it slip earlier today.2. She let (it) slip that she's still in love with her ex husband.3. I am sorry your secret slipped out when I was talking to your wife.4. He blurted out the hiding place of the suspect.
 let (it) slip slip out blurt out這些用法都指不小心說出某些事情，也就是說溜嘴的意思
He xcels on all fronts, putting the rest of us to shame.