be walking on eggshellsbe walking/treading on eggshells
if you are walking on eggshells, you are trying very hard not to upset someone.
It was like walking on eggshells with my father. The smallest thing would make him angry.
be walking on eggshells
To be acting with great care and consideration so as not to upset someone. The littlest thing tends to anger my mother, so I feel like I'm always walking on eggshells whenever I'm at her house.