Definition
To be extremely busy or overwhelmed with a particular task or activity.
忙碌不已
She's up to her eyeballs in wedding preparations lately.
她最近忙于婚礼的准备工作。
During finals week, I'm up to my eyeballs in studying every day.
在期末考试周，我每天都忙于学习。
We've been up to our eyeballs in work since the new project started.
自从新项目开始以来，我们一直忙于工作。