dot one’s i’s and cross one’s t’s —(also: dot the i’s and cross the t’s) be very thorough; pay attention to small details:
- When you do an investigation of somebody very prominent, make sure you dot your i’s and cross your t’s.
mind one’s p’s and q’s—be careful of one’s actions and behavior; act and speak correctly:
- You’ll have to mind your p’s and q’s if you want to be invited there again.