He's fallen head over heels in love with his boss.

他深深迷恋上了他的上司。

《牛津词典》

I was very attracted to men and fell head over heels many times.

我那时很容易被男性吸引，多次深陷情网。

《柯林斯英汉双解大词典》

Peter shot off and rushed head over heels down the mountain-side, turning wild somersaults on his perilous way.

彼得拔腿就跑，头也不抬地冲下山坡，翻着跟斗向前滚。

youdao

Australia's latest hunk du jour, , Adam Garcia, plays Kevin, a young man who falls head-over-heels in love with Violet.

CNN: Fleshdance

You don't want to find yourself head-over-heels in a relationship that holds you back for the rest of your life.

FORBES: Magazine Article

In the eighth, Cubs 1B Rizzo made a juggling catch of Zimmerman's popup to shallow right, tumbling head-over-heels and barely avoiding a collision with a teammate.

NPR: Strasburg Drops To 1-5 As Cubs Beat Nationals 8-2