I was knee-deep in work.

我当时工作缠身。

《牛津词典》

Don't bother your boss if he is on phone or is elbows deep in work.

如果你的上司在打电话或者专心工作。

youdao

Despite the excellent work and deep commitment of our nation's teachers and principals, students in high poverty, high-minority schools are unfairly treated across our country.

尽管我们国家的教师和校长工作十分出色，且作出了深刻的承诺，但在国内贫困程度高的地区中，少数民族学校的学生还是受到了不公平的待遇。

youdao

They work in deep secrecy: Inventors who sell to Intellectual Ventures often sign nondisclosure agreements.

FORBES: Patent Stalker

In a work of deep scholarship, Orlando Figes ranges widely and probes deeply into the causes of the Russian Revolution.

FORBES: Karl Marx's Russian Error Contains A Lesson For Liberal Democracies

The Wall Street Crash was a product of an economy in deep depression - so governments work hard to prevent such problems happening again.

BBC: A fateful day for investors